Mysimba

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  1. Click on the green "Get Started" button, then click "Start Consultation" button on the next page.
  2. Fill in our short consultation form.
  3. Choose delivery method and mode of payment.
  4. Our team of expert prescribers will assess whether medication is suitable.
  5. If you get the green light and it is deemed suitable, your order will be processed quickly and efficiently.
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Your privacy is important, Prescription Doctor are committed to keeping your details completely confidential.

This is why we also take steps to conceal your prescription products under two layers of packaging.

Delivery and Packing
Discreet Delivery?

We have a commitment to delivering a discreet service and understand your need for privacy. We ship all orders via a trackable courier using discreet, plain packaging.

Do I Need to Wait in All Day for Delivery?

Once your order is dispatched you will receive a tracking number via sms and email.

Do You Deliver on Weekends?

We deliver medications between Monday and Saturday. You can upgrade to Saturday delivery on Friday.

My Order Hasn’t Arrived What Should I Do?

You should receive a tracking number with your order which you can use this number to track your parcel online. This should give you a clear indication of where your parcel is. If you haven’t received your parcel in the time frame given by our couriers, contact your local depot to find out where it is. You can also contact our support team who will do this for you.

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On checkout you will be asked to leave your mobile number so our courier can text you about the delivery. This is also useful if the courier has problems finding your address. We will not use your mobile number for anything else.

Payment Methods
How Can I Pay for My Order?

You can pay for your order using credit, debit card or via bank transfer.

I Don’t Have a Credit Card, How Can I Pay?

If you don’t have a credit or debit card you can pay via bank transfer. We will give you a unique reference number at checkout along with details of how to make the transfer. Once the money has cleared in our account, we will process your order.

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We are a completely secure site and take many measures to ensure your details are kept safe. We understand that you have a right to extreme privacy when purchasing sensitive health medications. All information that you provide to us is stored on our secure servers. Any payment transactions will be encrypted using SSL technology.

Payment and refunds?

You can pay for your order using credit, debit card and bank transfer.

Card Payment: Please notify us that you wish to cancel your order. Your refund will show available In 1 - 3 days.

Bank Transfer: A member of our team will contact you requesting for your bank details. These details are only used to transfer the funds back into your account.

Patient Reviews: How Mysimba Has Made a Difference

Treatment Information

Table of contents:

About Mysimba Tablets 

Looking for a different way to manage your weight? Mysimba is a prescription weight loss tablet that helps reduce cravings and emotional eating by working on your brain’s reward system. It’s ideal for those who struggle with food obsession or eating out of habit rather than hunger, as it helps you fight the urge to consume more calories than necessary.

Originally developed to treat addiction, Mysimba is licensed in the UK to support weight loss in adults with a high body mass index and/or weight-related health conditions. By helping to reset your brain’s response to food, Mysimba makes it easier to stay on track with healthier habits.

You can buy Mysimba weight loss tablets from Prescription Doctor after an online consultation. If your order is approved before 3pm on a weekday, your treatment will be dispatched in discreet packaging via a next-day delivery service. 

Mysimba Cost and Pack Sizes 

Prescription Doctor is pleased to offer Mysimba weight loss tablets at the following prices: 

 

Quantity

Dosage (mg)

Price

112 tablets

8 mg / 90 mg

£109.99

 

What is Mysimba?

Mysimba is a prescription-only medication that combines two active ingredients (8mg of naltrexone and 90mg of bupropion) that work together to reduce hunger, limit cravings and control emotional or compulsive eating. While not a quick fix, the treatment can be a valuable tool when used in conjunction with a healthy diet and regular exercise.

Naltrexone is used to treat alcohol or opioid dependence, while bupropion is used as an antidepressant and to help people quit smoking. When used together in Mysimba, these two compounds target specific areas in your brain to help rewire your eating habits, allowing you to have more control over food choices.

What Makes Mysimba Unique?

Mysimba stands out from other weight loss pills due to its dual active ingredients and its effect on the body. While the majority of its competitors focus on fat storage, Mysimba tablets work by suppressing appetite. This means you won’t need to eat as much to feel full and will experience hunger pangs less frequently.

For optimal results, Mysimba weight loss pills should be used in conjunction with a low-calorie diet and regular physical activity. 

How Do Mysimba Weight Loss Tablets Work?

Mysimba affects the part of the brain that controls hunger and food cravings. Here's how:  

  • Naltrexone blocks the brain’s reward response to food. This means that when you eat foods that normally trigger a pleasure response, that effect is reduced, helping you break the cycle of reward eating. 
  • Bupropion is an antidepressant that stimulates certain neurons involved in appetite control and dopamine release. This can help reduce the urge to snack or resist the temptation of sudden cravings.

Together, these ingredients help reset your brain’s relationship with food, making it easier to eat less and make healthier choices. This is particularly useful for people who eat due to factors such as emotions, stress, or habit, rather than hunger.

How Long Does Mysimba Take to Work?

Everyone responds differently to medicines, but you may start noticing changes within the first few weeks. You can expect reduced food obsession/snack cravings early on. Full weight loss benefits typically accumulate over 8 to 16 weeks, especially once you reach your maintenance dose.

Your progress should be assessed at the 16-week mark. If you’ve lost at least 5% of your starting weight by then, treatment may be continued. Should this benchmark not be achieved, our clinicians may recommend an alternative weight loss medication. Remember that Mysimba works best in conjunction with regular exercise and a healthy diet, so you must be committed to making lasting lifestyle changes to achieve the best results. 

How Long Does Mysimba Last?

Mysimba continues to support weight loss throughout your treatment, provided you adhere to the regular dosage schedule. When you stop taking the medication, naltrexone will fully leave the body in approximately 10 hours, while bupropion takes around 42 hours. At the start of your journey, you’ll get a pack of 112 Mysimba tablets, which will last approximately 5 weeks. 

Mysimba Results for Weight Loss

The key studies for Mysimba involved four major Phase 3 trials. Over 4,000 (4,536) participants with a body mass index (BMI) from 27 to 45 kg/m² were trialled. These trials were double-blinded, placebo-controlled studies. This reduces bias because neither the participants nor the researchers know who receives which drug (could either be Mysimba or a placebo).

Studies lasted between 28 and 56 weeks and included a structured lifestyle modification program that focused on reducing caloric intake and increasing physical activity. In one of these trials, participants taking Mysimba lost an average of 5.4% of their body weight compared to just 1.3% for those on placebo. In another study, which included an intensive behavioural modification programme, participants on Mysimba experienced an even greater average weight loss of 8.1% at the 56-week mark, while placebo participants lost only 4.9%.

The main findings from these trials showed that 31% of participants on Mysimba achieved at least a 5% weight loss compared to only 12% in the placebo group. Improvements were also observed in waist circumference and certain cardiovascular health markers, such as cholesterol.

Mysimba did, however, result in more side effects compared to the placebo. The most common of these were nausea, constipation and headaches. More participants on Mysimba discontinued treatment due to these effects, suggesting that a higher chance of side effects can affect patient adherence

Mysimba Eligibility Criteria

Mysimba may be suitable if:

You have a body mass index (BMI) of 30 or more, or 
A BMI of 27+ with a weight-related health condition such as high blood pressure, diabetes (Type 2) or high cholesterol

Other important criteria include:

  • Be between 18 and 75 years old 
  • Not be pregnant or breastfeeding 
  • Not taking certain antidepressants or opioid painkillers

To make the most of your weight loss journey, it's recommended that you're ready to commit to lifestyle changes, such as a healthy diet and regular exercise. Our healthcare team at Prescription Doctor will go over all of this in a detailed online consultation before a prescription is approved.

How to Take Mysimba Tablets 

Take Mysimba tablets by mouth. Be sure to swallow the pills whole; never break or bite into them. While you can take the medication with or without food, doing so with a meal may help reduce side effects like nausea.

To get the most from Mysimba, it's essential to combine the tablets with a balanced diet. What does this involve? Whole foods, lean proteins, healthy fats and plenty of fruit and vegetables. This should be paired with regular physical activity such as walking, swimming or strength training.

Think of Mysimba as a support tool rather than a magic fix; it helps control your cravings so you can better stick to your food and exercise plans. Regular check-ins with your clinician can help track your progress and make adjustments if needed.

Mysimba Dose Regimen

Each Mysimba tablet contains 8 mg of naltrexone and 90 mg of bupropion. The full maintenance dose is 32 mg / 360 mg per day, divided across four tablets.

It’s important to build your dose up gradually over 4 weeks. An example dosing schedule would be: 

 

Week No.

Dose

Week 1Take one tablet every morning
Week 2Take one tablet in the morning and one tablet in the evening
Week 3Take two tablets in the morning and one tablet in the evening
Week 4 and onwardTake two tablets in the morning and two tablets in the evening.

 

Starting at a lower dose helps your body adjust and reduces the risk of nausea or headaches. If you experience strong side effects during the dose increase, your prescriber may suggest staying at your current dose for a longer period before increasing it.

How Long Does a Pack of Mysimba Last?

Once you reach the full dose (4 tablets a day), a 112-tablet pack will last 28 days. In the first month, it may last a little longer, depending on your schedule. If you stop the medication or your dose is adjusted, speak to your clinician before restarting.

What If I Miss a Dose of Mysimba?

Skip the missed dose and continue as normal. Don’t double the dose to make up for it. Missing one dose occasionally won’t affect your long-term results. However, if you miss several days, you may need to restart at a lower dose to avoid side effects, as your body’s response to the medicine has changed. Discuss this with your clinician.

Mysimba Side Effects

Like all medicines, Mysimba can cause side effects. However, most of them will subside after a few weeks as your body gets used to the medication. Here are some Mysimba side effects that you may experience: 

 

Common
(affects 1 in 100 to 1 in 10 people)

Uncommon
(affects 1 in 1000 to 1 in 100 people)

Serious 
(seek immediate help)

Nausea
Constipation 
Diarrhoea 
Dizziness 
Dry mouth 
Headache
Anxiety or irritability
Insomnia
Sweating

 
Seizures 
Suicidal thoughts 
Severe allergic reactions
 

 

The above is not an exhaustive list of Misimba side effects. Please refer to the Product Information Leaflet for further details. 

How to Manage Mysimba Side Effects

To manage mild side effects:

  • Take tablets with food to reduce nausea 
  • Drink plenty of water if your mouth is feeling dry
  • Avoid caffeine if you feel jittery or anxious 
  • Keep to a regular sleep schedule if you notice insomnia

If you experience serious side effects or your symptoms don’t ease after a few weeks or worsen, stop taking the medication and speak to your clinician.

Mysimba Interactions and Allergies

It is important to be aware of potential interactions between Mysimba and other medications. Informing the prescriber about all current medications, including those prescribed by a doctor and over-the-counter medications, is crucial to ensure safety and prevent potential adverse effects. It is advisable to consult your healthcare professional or refer to reputable sources for a comprehensive list of interactions. If you have a known allergy to naltrexone hydrochloride, bupropion hydrochloride, or any other ingredient in Mysimba, it is important to avoid taking this medication.

Bupropion: To view a comprehensive list, visit NICE interactions.

Naltrexone: To view a comprehensive list, visit NICE interactions.

How to Buy Mysimba Weight Loss Tablets

The easiest way to buy Mysimba is through an online weight loss service such as Prescription Doctor. Remember that your safety and privacy come first, so you should only trust a pharmacy that’s registered with the General Pharmaceutical Council (GPhC).

Can You Buy Mysimba Online?

Yes, it’s possible to buy Mysimba online with Prescription Doctor. As a licensed provider, we offer discreet delivery and full clinical oversight, ensuring you are in safe hands.

Here’s how our process works:

  • Consultation: Provide information about your medical history, any existing health conditions and lifestyle factors which can influence treatment. Completed in-person or via online questionnaire.
  • Assessment: Our prescribers review your answers to determine if Mysimba is right for you. 
  • Decision: Depending on the outcome of the consultation, a prescription will be issued for the medication, or an alternative weight loss treatment may be more appropriate for you. 
  • Delivery: If approved before 3pm on a weekday, your order should be delivered in secure packaging the next day. A full refund is issued in the event your order is cancelled for whatever reason. 
  • Follow-up: Regular check-ups are scheduled once you have started Mysimba weight loss treatment to ensure everything is optimised.

Do I Need a Mysimba Prescription?

Yes, Mysimba is classified as a prescription-only medication, so it cannot be bought over the counter from pharmacies. This is because a licensed clinician is required to determine whether it’s suitable for your circumstances before issuing treatment, a process that is usually carried out via a consultation. 

Is Mysimba Available on the NHS?

No, Mysimba isn’t widely available on the NHS. Instead, you must obtain a prescription from private or online healthcare services, such as Prescription Doctor. You may also be able to access Mysimba tablets via some specialist weight loss clinics under certain criteria. 

Frequently Asked Questions About Mysimba Tablets

How to Store Mysimba

Store at room temperature (25°C). Keep Mysimba tablets in their original packaging and out of reach of children or animals. Keep an eye on the expiry date and do not use past this point. Do not refrigerate or freeze the medication. 

How Can I Track My Weight Loss Progress with Mysimba?

Keeping a food diary can be helpful in tracking eating habits and exercise routines. This allows you and your healthcare provider to identify areas for improvement, such as excessive consumption of specific food groups or inadequate exercise. Consulting an online prescriber or a nutritionist is recommended for personalised advice on dieting and exercising.

Remember that diet and exercise play crucial roles in achieving weight loss. It is essential to maintain a balanced, nutritious diet that is low in saturated fat. Engaging in physical activities, such as sports, running, or dancing, can significantly contribute to achieving weight loss goals.

Who Shouldn’t Take Mysimba Tablets

Avoid Mysimba if you:

  • Are allergic to bupropion or naltrexone 
  • Have epilepsy or a seizure disorder 
  • Have a history of eating disorders (e.g. bulimia, anorexia) 
  • Are taking opioid medication or in opioid withdrawal 
  • Have uncontrolled high blood pressure 
    Have certain mental health conditions (speak to your clinician)

This is not a comprehensive list; certain medicines should also be avoided, such as monoamine oxidase inhibitor antidepressants (MOAIs - a specific class of antidepressant) or if you’re undergoing alcohol detox.

Can I Take Mysimba While Pregnant?

It’s not recommended that you take Mysimba tablets if you are pregnant or breastfeeding. If you are pregnant, breastfeeding, think you might be pregnant, or are planning on having a baby soon, speak to your doctor or a pharmacist before taking Mysimba. If you become pregnant while taking Mysimba, speak to your doctor as soon as possible.

Can You Drink Alcohol on Mysimba?

It’s best to limit alcohol consumption when taking Mysimba weight loss tablets. This is because it can increase your risk of seizures while amplifying side effects like dizziness, nausea, or mood swings. Avoid drinking heavily or binge drinking when on treatment.

Can I Drive When Taking Mysimba?

Taking Mysimba may cause you to feel drowsy or dizzy. If you notice that you’re experiencing one of these potential Mysimba side effects, it’s recommended that you avoid driving or operating any machinery until you feel well enough to do so. 

Can I Switch to Mysimba from Another Weight Loss Treatment? 

Yes, but you should allow time for other weight-loss treatments, such as Mounjaro or Nevolat, to be removed by your body first. This is known
as a medicine’s ‘half-life’ — the time it takes for the drug concentration in your body to halve — and differs between each drug. In practice, most people wait around 1–2 weeks.

Mounjaro, for example, has a half-life of 5 days, but the half-life for Nevolat is much shorter (13 hours). Always consult with your clinician before switching, as they will be able to determine whether the replacement medication is suitable for your specific circumstances and advise you on how to carry out the transition safely. Your new plan will begin with the lowest dose of Mysimba and gradually increase over time.

It’s also worth noting that different weight loss treatments have different routes of administration. Products such as Wegovy and Mounjaro are injection pens, while Xenical and Alli are available in tablet form. How you prefer to take your medication could be a factor in whether you decide to switch or not. 

Can I Use Mysimba Alongside Other Weight Loss Treatments?

No, you should not take Mysimba tablets in conjunction with any other weight loss medication such as Mounjaro, Wegovy, or Nevolat. If you would like to switch from Mysimba to an alternative treatment, please consult your doctor or one of our clinicians beforehand. 

What are the Alternatives to Mysimba?

Licensed weight loss treatments come in two forms: ingestible tablets or subcutaneous injections. Some popular alternatives to Mysimba include Mounjaro, Wegovy, Xenical, and Nevolat. All of these treatments require a prescription. If you’d prefer an over-the-counter solution, Alli is also available. 

Why Buy Mysimba Online with Prescription Doctor?

Prescription Doctor helps streamline your weight loss journey with a seamless experience, from online consultation to discreet next-day delivery. We start with a thorough questionnaire to assess your suitability for treatment, and are available throughout the process to offer guidance and support.

We provide a secure and user-friendly platform for ordering Mysimba tablets and other medications. Our dispensing pharmacy is registered with the General Pharmaceutical Council, ensuring you can be completely confident in the quality of our products and services.  


Additional Resources

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Instructions for Using Mysimba

If you’re struggling to lose weight with diet and exercise alone, but are unsure about resorting to needles, weight loss tablets might be the solution. Mysimba is one such medication, containing two active ingredients, whereas most have only one. Originally licensed for substance addiction, the treatment was also found to be suitable for obesity.When considering a particular medication, it’s natural to want to research factors such as how long it takes to work and how long side effects may last. This is to help you determine whether the treatment might be a suitable aid to your weight loss journey.Understanding how to administer the medication is also essential, with important topics including how many tablets to take, when it’s best to take them, and any restrictions on suitability. That’s where this article can help.Join us as we explore how to take Mysimba, the dosage schedule, and answer some frequently asked questions.   [medical_form product_id="192" text="START YOUR MYSIMBA CONSULTATION TODAY" type="button"] What Does Mysimba Do?Mysimba is a prescription-only weight loss treatment that can help adults with obesity or those who are overweight with weight-related medical conditions to lose weight alongside a calorie-controlled diet and regular exercise. Mysimba comes in tablet form, containing 8 mg of naltrexone hydrochloride and 90 mg of bupropion hydrochloride.Naltrexone and bupropion act on brain regions that regulate appetite, energy balance, and the pleasurable sensations you experience when you eat. In doing so, Mysimba keeps you feeling fuller for longer and blocks specific signals in the brain's reward system, further lowering your appetite and making it easier to stick to healthy lifestyle changes. How to Take Mysimba TabletsMysimba tablets should be swallowed whole with a glass of water, and ideally with food to help minimise the chance of side effects. The tablets are prolonged-release, meaning they release the active ingredients into your body over an extended period. You mustn't break, crush, or chew them, as this could affect how they work.  It is recommended that you avoid or limit your alcohol intake while taking Mysimba, because mixing them can increase the chance of seizures and other mental disorder events.Mysimba Dosage InformationMysimba follows a dosage schedule to help your body get used to the medication. This is similar to other weight loss treatments, like Wegovy, whose dosage schedule increases over 17 weeks until you reach the maintenance dose, and Mounjaro’s 21-week dosage schedule.Your Mysimba dosage should be gradually increased over 4 weeks. This reduces the risk of common side effects whilst your body adjusts to the medication. How Many Mysimba Tablets Per Day?You should take Mysimba every day, as follows:WeekNumber of TabletsDosage ScheduleWeek 111 tablet in the morningWeek 221 tablets in the morning and 1 in the eveningWeek 332 tablets in the morning and 1 in the eveningWeek 4 onwards42 tablets in the morning and 2 in the eveningWhen Should You Increase the Dose?You should increase the dose by 1 unit each week, starting on the day you begin. For example, if you start taking Mysimba on a Monday, the next dose increase would be the following Monday.Mysimba Dosage ConsiderationsThere are several important factors to consider when taking Mysimba. One of those is to remain consistent with your dosage schedule to maximise its effectiveness and minimise side effects. Following your clinician’s instructions and sticking to the dosage schedule will not only help your body get used to the medication but also pave the way for successful weight loss.  {add_product_block(192)} When Is the Best Time to Take Mysimba?MySimba should preferably be taken with food, as this reduces the chance of nausea and vomiting. It should be taken in the morning and evening, so you might want to take it with your first and last meal. It doesn’t matter if you take it before, during, or after eating.Can You Take Mysimba at Night?You can take Mysimba at any time in the evening or night, but preferably with food. Try to stick to around the same time each day.How Often Should Mysimba Be Taken?This depends on whether you are still on the titration dose or the standard dose. Once you reach the maximum dose, you should take it twice a day, every day.  What Should I Do If I Miss a Dose?If you miss your Mysimba dose, skip it and carry on as normal when your next dose is due. Never take a double dose, as this could cause serious side effects.What Should I Do If I’ve Taken More Than I Should?If you’ve taken more Mysimba than you should, it could increase your chance of having serious side effects, such as a fit. Go to A&E or speak to a doctor immediately and take your medication packet with you.Who Should Not Take Mysimba?Mysimba is not suitable if you are:PregnantBreastfeedingUnder 18 or over 75Taking another medication containing bupropion or naltrexoneIf you have any pre-existing medical conditions, such as depression, speak to your doctor, as Mysimba may not be suitable. You should also inform your prescriber of all other medications that you’re taking, including herbal supplements, so they can determine whether the treatment is right for you. How to Take Mysimba: Frequently Asked QuestionsMysimba is a convenient, easy-to-swallow weight loss medication. It can be a great alternative if injections aren't right for you, but it’s natural to have questions about how to take it and how it may interact with existing medications. Let’s answer those questions here, so you can decide if Mysimba is a suitable weight loss option for you.  {add_product_block(192)} Can You Take Mysimba on an Empty Stomach?You can take Mysimba on an empty stomach, but it’s not recommended. Ideally, take your Mysimba dose with a meal or a light snack to help reduce the risk of side effects, such as nausea, vomiting, stomach pain, and constipation. Taking it with food can also help your body better absorb the active ingredients.How Long Does it Take for Mysimba to Work?Mysimba starts working as soon as you take the first tablet, and you may notice changes in your hunger and cravings within the first few days or weeks. However, it can take up to 16 weeks for you to fully notice significant weight loss.If, after this time, you haven’t lost at least 5% of your starting weight, your clinician may suggest switching to an alternative weight loss medication. You can find out more in our guide ‘How Long Does Mysimba Take To Work?’ Can I Take Mysimba and Mounjaro Together?No, you cannot take Mysimba and Mounjaro together due to safety concerns. Taking Mysimba and Mounjaro together increases the risk and severity of side effects, like nausea and diarrhoea. Although they work in different ways, Mysimba and Mounjaro target your appetite, so taking them together could lead to nutrient deficiencies.If you think that Mysimba isn’t working for you, speak to your clinician about switching to Mounjaro or another weight loss medication. They can provide tips and support to help you get the most out of your treatment. Can You Take Mysimba and Orlistat Together?No, it is not recommended to take Mysimba and orlistat together because it is not safe to take more than one weight loss medication at a time. Combining these weight loss tablets can increase the risk and severity of side effects.If you’re not sure which weight loss medication is right for you, our clinicians can help. They can advise you on which weight loss tablet or injection may be best suited to your individual circumstances.Can I Take My ADHD Medication With My Mysimba?You must tell the clinician before taking Mysimba about any prescribed, over-the-counter, or herbal medications you currently or plan to take, including any ADHD medication. Some off-label ADHD medications, like stimulants and antidepressants, can increase your risk of seizures. This can further increase if you combine them with Mysimba, which contains bupropion, a type of antidepressant.Both Mysimba and ADHD medications can impact your blood pressure and heart rate. So, a clinician will need to monitor you carefully during treatment.  Can You Take Mysimba with Sertraline?No, generally it is not advised to take Mysimba with sertraline because combining them can increase the risk of side effects. You should tell your clinician before taking Mysimba if you are taking sertraline, so they can decide what is best for you.  Can You Take Mysimba with Citalopram?Yes, it may be possible to take Mysimba and citalopram together, but your clinician will need to monitor you closely because this combination can increase the risk of side effects. In some cases, a clinician may advise against taking these medications at the same time.Combining them increases the risk of seizures and serotonin syndrome, a rare but life-threatening condition that causes hallucination, agitation, high temperature, increased heart rate, and muscle stiffness. In most cases, a clinician will tell you not to take Mysimba at the same time as citalopram unless the benefits outweigh the risks. Kick-Start Your Weight Loss Journey with MysimbaMysimba’s straightforward dosing schedule and the fact that it comes in tablet form instead of an injection make it a popular choice to help combat obesity. If you think the treatment may be suitable for you, Prescription Doctor should be your first port of call.We’ve made the process of accessing healthcare as hassle-free as possible. With us, there’s no need for lengthy waiting times or face-to-face appointments. Just complete a brief online medical questionnaire, and our specialist clinicians will review your information to determine whether Mysimba is suitable for your circumstances. If not, an alternative solution may be recommended.Everything dispatched from our General Pharmaceutical Council-registered dispensing pharmacy is sent in plain packaging that does not give away its contents, ensuring complete confidentiality. Orders approved before 3pm on a weekday are also eligible for next-day delivery, giving you fast access to your medication.Our clinicians are available to provide support throughout your journey. You can get in touch whenever you need guidance, or they will regularly check in with you to monitor your progress and assess whether the treatment programme is working as it should. We are here to help you succeed.Are you ready to kick-start your weight loss journey? Sign up for a Mysimba consultation today with Prescription Doctor.  SourcesEMC (2023): Mysimba 8 mg/90 mg Prolonged-release Tablets.NHS (2023): Obesity Treatment.NICE (2023): Naltrexone with Bupropion.
Read more →
Instructions for Using Mysimba
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How does Mysimba work?

Although weight loss injections such as Mounjaro and Wegovy have dominated the headlines in recent years, they are far from the only treatments available to help you reach your goals. Mysimba tablets, for example, are an effective alternative, especially for individuals who don’t like the idea of using needles.Originally licensed to tackle substance addiction, Mysimba’s mechanisms of action have also been clinically proven to support weight loss when taken alongside a healthy diet and regular exercise. The question is, exactly how does Mysimba work?In this article, we’ll explore Mysimba’s dual active ingredients and examine how they support weight loss. We also outline the outcomes of clinical trials and discuss how long it takes the treatment to work. Let’s get started. [medical_form product_id="192" text="START YOUR MYSIMBA CONSULTATION TODAY" type="button"] Mysimba: How Does it Work?Mysimba is a combination of two medicines (Naltrexone and Bupropion) that work together like a well-oiled team, targeting different parts of the brain. This tag-team approach means you feel less hungry overall and can therefore be satisfied with smaller meals. It also helps you to use up more energy, potentially burning additional calories throughout the day.Now, let’s take a closer look at Mysimba’s two active ingredients and outline how they work to support weight loss. Naltrexone for Weight Loss and Bupropion for Weight Loss: How Do They Help?The exact mechanisms by which naltrexone and bupropion work for weight loss are not well understood. Separately, naltrexone’s primary function is to manage addiction. It binds to opioid receptors in the brain and blocks the effects of opioids. Your opioid receptors are involved in numerous bodily functions, so blocking them can significantly affect other physiological processes. Because these receptors also regulate hunger, mood, and reward, this could potentially explain the apparent efficacy of Naltrexone for weight loss.Bupropion, on the other hand, influences neurotransmitters in the brain – masses of chemicals which send messages all over your body, almost like an internal messenger system. Two of these neurotransmitters, dopamine and noradrenaline, are affected by bupropion, which can lead to a loss of appetite, though the effect varies from person to person.When combined, naltrexone and buproprion act on specific brain pathways to increase energy expenditure, lower food intake, and keep you feeling fuller for longer. These pathways are also associated with the control of pleasure, including the pleasurable feelings we get from food, particularly high-fat or sugary foods. By controlling the pleasurable feelings you get from food, Mysimba can help you lose weight when combined with healthy lifestyle changes.  Does Mysimba Work for Weight Loss?Clinical trials provide important data to understand how Mysimba can help with weight loss.Mysimba’s evidence comes from 4 studies, totalling 4,500 patients classed as obese or overweight compared to a placebo drug. The studies were part of a weight loss programme alongside diet and exercise advice. Treatment lasted over 28 or 56 weeks.The main results (which include patients who dropped out) from the European Medicines Agency show:Average weight loss: Compared with placebo across three studies, Mysimba led to an average weight loss of 3.7% to 5.7%, whereas the placebo group experienced a weight loss of 1.3% to 1.9%.Achieving weight-loss goals: A considerably higher proportion of patients on Mysimba (28-42%) lost at least 5% of body weight. The success rate increased further with additional counselling. The placebo percentage was 12-14%.Double-digit reduction: For greater weight loss of 10%, this was reported in 13-22% of Mysimba users, but in only 5-6% of those on placebo. Again, the success rate improved with additional counselling.The specific details of the clinical trials are available in the Summary of Product Characteristics for Mysimba.Does Mysimba Work Immediately?Yes, but it can take several weeks before you notice the full effects. It takes a while for the active ingredients to build up in your system and for you to see visible weight loss results, but you may notice positive changes in your appetite and food intake within a few days.Research has shown that at the maximum doses of 32mg of naltrexone hydrochloride and 360 mg of bupropion hydrochloride, after 4 weeks, you can lose around 3% of your starting body weight, and after 56 weeks, 8%. How Long Does Mysimba Stay in Your System?Mysimba is usually cleared from the body within about 4 days after your last dose. How long Mysimba stays in your system depends on the two active ingredients, naltrexone and bupropion, because they have slightly different half-lives. This is the time it takes for your body to reduce the dose of Mysimba by half.Naltrexone takes approximately 24 to 28 hours to leave your body completely, while bupropion takes around 4 days. That means it should be cleared after 4 days. If you have experienced Mysimba side effects, you should notice that they improve after this time. {add_product_block(192)} How Do I Know if Mysimba Has Worked?Within a few days of starting Mysimba, you may notice your appetite lessens, and you crave food less. These can be good signs that naltrexone and bupropion are affecting your body. However, it can take a few weeks before you may begin to lose weight or notice changes in your appearance.There are two main stages of noticing weight loss:Rapid weight loss: Weight loss usually happens quickly in the first 4 to 6 weeks. Most of the weight you lose is water, rather than body fat.Slow weight loss: Weight loss tends to slow in the second stage, and you may experience a plateau. You may need to adjust your approach to kick-start your progress again.More than half of people who take Mysimba lose at least 5% of their initial body weight in the first 16 weeks of treatment. If you haven’t, speak to your clinician, as Mysimba may not be the best option for you. Our clinicians can help you choose an alternative weight loss medication that may better suit your needs. Frequently Asked QuestionsChoosing the right weight loss medication for you depends on several factors, including how it works in the body. You’ll likely also want to know the impact it can have on your current lifestyle, such as whether you can drink alcohol with it, how you take it, and what results you can expect to achieve. We answer those questions below. Does Mysimba Work with Alcohol?No, ideally you should avoid or limit your alcohol intake while taking Mysimba because it can increase the risk of seizures, mental disorder events, or reduce your alcohol tolerance. Your clinician may suggest that you avoid alcohol completely or drink as little as possible.If you drink a lot of alcohol before starting Mysimba treatment, discuss this with your clinician first. It is essential that you don’t just stop drinking alcohol, as this can also increase the chance of having a seizure.How Do You Take Mysimba?Mysimba is an oral tablet that you swallow, preferably with food. They should be swallowed whole and not crushed or chewed. You start on a lower dose of Mysimba, which gradually increases over four weeks until you reach the maximum dose.The Mysimba dosage schedule looks like this:Week 1: One tablet once a day in the morning.Week 2: One tablet in the morning and one tablet in the evening every day.Week 3: Two tablets in the morning and one in the evening daily.Week 4: Two tablets in the morning and two tablets in the evening every day.  How Much Weight Can You Lose on Mysimba?The average weight loss on Mysimba is 8.1% over 56 weeks at the maximum dose. More than 50% of people lost at least 5% of their starting body weight after 16 weeks of taking Mysimba tablets, compared with 19% given a placebo.  Remember, weight loss is a journey, not a race, so don’t worry if you don't see the same results as those reported in clinical trials. If you haven’t lost at least 5% of your weight by week 16, speak to your clinician, who may recommend an alternative weight loss medication.   Begin Your Mysimba Weight Loss Journey with Prescription DoctorIf you think Mysimba tablets could be the right treatment to help you lose weight, your next decision is to determine the best place to obtain them. Since 2013, Prescription Doctor has built a strong reputation for helping people like you achieve their weight loss ambitions.Our mission is to make healthcare more accessible, which is why we enable you to order the medication you need at any time from your own home. Just complete our brief online questionnaire, and our specialist clinicians will review your information to determine whether your chosen treatment is suitable for your circumstances. If approved, your items will be dispatched from our General Pharmaceutical Council-registered dispensing pharmacy in plain packaging for total discretion.We’re here to support you at every stage of your weight loss journey. Our clinicians will regularly check in with you to assess your progress and ensure your treatment programme delivers the best possible results. You can also contact our team with any questions or for additional guidance, or check out our library of Mysimba articles. We are here for you.Ready to get started? Begin your Mysimba consultation with Prescription Doctor today and let us support you throughout your journey.  SourcesEMA (2025): Mysimba. EMC (2023): Mysimba 8 mg/90 mg prolonged-release tablets. Journal of the Academy of Nutrition and Dietetics (2014): Time to Correctly Predict the Amount of Weight Loss with Dieting. P&T (2016): Naltrexone/Bupropion ER (Contrave).Pharmacological Research (2014): Naltrexone/bupropion for obesity: An investigational combination pharmacotherapy for weight loss.NICE: Naltrexone with bupropion. 
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How does Mysimba work?
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How Quickly Does Mysimba Act?

When researching weight loss treatments such as Mysimba, several factors should be considered. It’s important to understand how much weight you could lose, what side effects might occur, and how to administer the medication.Something else you may be interested in is how long it takes your chosen treatment to start supporting your journey. Different medications will take different lengths of time, while there is usually a gap between the active ingredient taking effect and you starting to notice signs of weight loss.In this article, we answer the question “How long does Mysimba take to work?” We’ll also explore the factors that could affect the treatment’s efficacy and highlight success stories from Mysimba customers. Let’s begin.  [medical_form product_id="192" text="START YOUR MYSIMBA CONSULTATION TODAY" type="button"] What is Mysimba Used For?Mysimba is a prescription weight loss medication for people who are overweight or obese. It's usually prescribed to people with a Body Mass Index (BMI) of over 27 and those struggling with weight-related health complaints, including high blood pressure, diabetes, or high levels of fat detected in the blood.Mysimba contains two active ingredients: naltrexone and bupropion, both licensed in the EU. These active ingredients reduce your appetite by acting on parts of the brain known to control how much we think we need to eat and our energy levels.Additionally, naltrexone and bupropion can reduce the pleasure you get from eating. This can help reduce the likelihood of you overeating or “emotional eating.”How Long Does Mysimba Take to Work?Mysimba is absorbed into your body within a few hours. However, exact times can vary depending on your metabolism and other factors, such as whether you take the medication on an empty or full stomach.The treatment will start to work from the first tablet, but it will take a few weeks for its full effect to be reached. You may notice a gradual change in your appetite during this time. However, you may have to wait up to eight weeks before seeing any significant weight loss.  How Long Should I Take Mysimba For?You can take Mysimba for as long as needed. You will need a 16-week check-up with your doctor, followed by annual check-ups. After 16 weeks, your doctor will check if you’ve lost at least 5% of your starting body weight. Your doctor will recommend that you stop Mysimba if you:Haven’t lost at least 5% of your starting body weightExperience intolerable side effects that are not going awayHave high blood pressureBecome pregnantRisks and Benefits of Long-term UseMysimba can have some risks with long-term use, such as:High blood pressureA slightly increased chance of having a seizure (1 in 1,000)Mental health problems, such as depressionLupusYour doctor will monitor your health while taking Mysimba, and you can stop the medication at any time, as long as you speak to a healthcare professional first.Mysimba can also have some benefits with long-term use, such as:Weight loss, which can improve other health conditions, such as diabetes, and increase your life expectancyA decrease in appetite, which can help you make long-lasting changes to how you eatImproved confidence and self-esteem {add_product_block(192)} How Effective is Mysimba? Potential Mysimba ResultsData published by the European Medicines Agency highlights several studies that concluded Mysimba is an effective treatment for weight loss. In three of the studies, patients were given Mysimba or a placebo in combination with a weight loss programme. The weight loss programme included counselling, dietary advice, and regular exercise.The average weight loss for patients taking Mysimba was around 3.7 to 5.7%, compared with 1.3 to 1.9% among the placebo group. The weight loss was even greater in a fourth study, which required patients to undergo a more intense therapy and counselling program.By the end of the trial, the average weight loss for those taking Mysimba in conjunction with intense counselling sessions was 8.1%. In contrast, those taking a placebo alongside their therapy sessions lost an average of 4.9%.Factors that Affect the Efficacy of MysimbaSeveral factors can interfere with Mysimba and reduce its effectiveness. Mysimba will not work on its own and requires a serious commitment to changing your lifestyle. That means following a weight loss diet plan and increasing the amount of physical activity you do.The effects of Mysimba also depend on how your body responds to the medication. You may lose more or less weight than the average weight loss in clinical trials because of differences in your metabolism, lifestyle, and overall health.It’s also not recommended to take Mysimba after the age of 75, while individuals over 65 will need to exercise caution. If you have a pre-existing health condition or are taking certain medications, Mysimba may work differently. Your clinician will discuss this with you when prescribing.Consistency is another factor that can affect Mysimba’s efficacy. Missing doses may cause fluctuations in the amount of medication in your system, which can not only increase the risk of side effects but also affect the amount of weight you could lose.  Overall, the effectiveness of Mysimba depends on its mechanism of action, combined with your commitment to making lifestyle changes to support your weight loss journey. What to Do If You Find the Dose IneffectiveIf you find your Mysimba dose is not effective, wait a few weeks after starting treatment. Your doctor will check in after 16 weeks, but you can speak to them sooner if you don’t think Mysimba is working for you.Do I Have to Follow a Diet and Exercise Plan on Mysimba?Simply taking Mysimba and making no other lifestyle changes is likely to be ineffective for weight loss. Mysimba is a supplementary treatment that supports a wider weight loss plan. This plan typically includes exercise tailored to your current fitness level and a calorie-controlled diet consisting of healthy foods.  Mysimba Success StoriesClinical trial data can provide helpful insights into the effectiveness of weight loss medications, but they are only one aspect to consider. Stories from real-life Mysimba users can provide valuable insights into what to expect, how to manage side effects, and how effective it can be. In this section, we discuss some of the reviews Prescription Doctor patients have left about Mysimba.Many Mysimba users have shared how the medication has helped to reduce their appetite and support significant weight loss. Traci Morrow said: “I have just started my prescription 4 days ago, and I can honestly say it is curbing my appetite and my thoughts about food. I’m hoping as I get into the weeks, it will continue to benefit me.” Most users do not report severe or significant side effects and state that they wear off after a few days of taking Mysimba, like Joanna Basik, who said,  “Very good product when you keep watching what you eat. First 4 weeks lost 6kg with minimal exercise. Side effects gone after 3rd day.” While some people, like Tricia Mottram, find that Mysimba: “Seems to be working fine and no side effects.” Naltrexone and bupropion start working as soon as you take the first dose of Mysimba, and although it can take several weeks before you may notice significant weight loss, users, like Rihab Halloum, share that: “Mysimba reduces my feelings of hunger, and I’m still in the first week.” Mysimba success stories like these, along with research data, can help you decide whether this type of weight loss medication is suitable for you. If you’d like to read more success stories or find more real-world opinions about the treatment, please check out our dedicated Mysimba reviews page. {add_product_block(192)} Begin Your Mysimba Journey with Prescription DoctorIf you’re thinking about embarking on a medicated weight loss programme with Mysimba, Prescription Doctor is here to help. For over a decade, we’ve supported countless individuals in achieving their goals, and we’re ready to do the same for you.Our weight loss service begins with a straightforward online form that covers your medical history and any other treatments you may be taking. Your information is then reviewed by our specialist clinicians to determine whether your chosen medication is suitable for your circumstances. Once approved, your order is dispatched by our General Pharmaceutical Council-registered pharmacy direct to your door.We offer continuous support throughout your weight loss journey. Our clinicians are available to answer any queries you may have and will regularly check in with you to evaluate progress and ensure your treatment programme is delivering the desired results. In addition, our website contains a wealth of useful information about Mysimba and other available medications.  Ready to take the first step? Start your Mysimba consultation with Prescription Doctor today. SourcesEMC (2025): Mysimba 8 mg/90 mg Prolonged-release Tablets.NHS (2023):  Obesity Treatment.NICE (2023): Naltrexone with Bupropion.EMA (2025): Mysimba. EMA: Summary of Product Characteristics. 
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How Quickly Does Mysimba Act?
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How Long Mysimba Side Effects Typically Last?

When researching the most suitable weight loss medication for you, the potential impact of side effects is one of the most important factors. Each treatment has different active ingredients and mechanisms of action, and may react differently to other medications you’re currently taking, meaning it’s essential to have a clear understanding of what you could expect.Mysimba is no exception. Unlike better-known treatments like Mounjaro and Wegovy, Mysimba comes in tablet form, making it a strong option for someone who doesn’t like injections. It also contains two active ingredients that work in tandem to curb cravings and reduce food intake.But what about the side effects of this medication? In this article, we’ll explore the various aftereffects of Mysimba, how to tackle them, and answer the question “How long do Mysimba side effects last?” Let’s get started.  [medical_form product_id="192" text="START YOUR MYSIMBA CONSULTATION TODAY" type="button"] What are the Side Effects of Mysimba?All medications, including Mysimba, can cause side effects. The most common side effects are gastrointestinal symptoms, such as feeling or being sick (nausea or vomiting), constipation, and headaches. Most of these side effects occur at the beginning of treatment as your body gets used to the active ingredients and can usually be managed at home.Other common Mysimba side effects include:anxietydizzinessshakinesssleep issuestaste changesdifficulty concentratingtirednessfast or irregular heartbeathot flushesirritabilitysweatingstomach painUncommon Mysimba side effects include:hivesmood changesbalance issueshypersensitivitymemory lossmotion sicknessabnormal dreamsFor a more detailed explanation of Mysimba side effects, check the patient information leaflet (PIL) enclosed with the medication.  How to Determine the Duration of Mysimba Side EffectsMysimba side effects vary from person to person. Some people experience side effects after the first dose, while others may not notice any until their Mysimba dosage is increased. Not everyone who takes Mysimba will get side effects.Several factors can affect the duration of Mysimba side effects, including how long the medication stays in your system, any other drugs you take, your age, and any underlying health conditions you may have. Factors that Influence the Duration of Mysimba Tablets Side EffectsVarious factors can influence how long Mysimba side effects will last. These include:Medication Half-Life: Understanding Mysimba's half-life can help predict how long its side effects will last. The term ‘half-life’ refers to the time it takes for 50% of a medication to be eliminated from the body. Mysimba’s half-life differs by active ingredient: Bupropion lasts 21 hours, and Naltrexone lasts 5. As the active ingredients leave your body, the side effects of Mysimba should start to improve.  Pre-existing Medical Conditions: Some conditions, such as kidney or liver issues, can prolong Mysimba's time in your system, potentially increasing the duration and severity of side effects.Other Medications: Certain medications can interact with Mysimba and vice versa, which may increase the likelihood of side effects or potentially make them worse.Age: Age-related changes in the body’s ability to process and metabolise medication can make you more sensitive to side effects. For example, people over 65 may be more likely to experience central nervous system side effects, such as dizziness and shaking. Gastrointestinal side effects can also be a common reason for older people to stop taking Mysimba.Incorrect Dosing: Missing Mysimba doses or taking too much can increase your risk of side effects. If you take more Mysimba than prescribed, speak to a doctor immediately or go to A&E.Long-Term Side Effects of MysimbaThe long-term side effects and safety of Mysimba are not fully known. Although most of the common side effects, like nausea, constipation, and headaches, are short-term and tend to improve as your body gets used to the medication, there may be some long-term consequences, like cardiovascular issues.Research suggests that there are no long-term cardiovascular side effects if you take Mysimba for a year. Still, there is no conclusive evidence about cardiovascular safety beyond this point. If you have not lost at least 5% of your body weight after 1 year, a clinician will tell you to stop taking Mysimba. A clinical study investigating the long-term effects of Mysimba on the heart is expected to announce its results in 2028. {add_product_block(192)} Potentially Serious Mysimba Side EffectsThere are some potentially serious side effects of Mysimba, which, if you get them, need immediate medical attention. If you notice any of these side effects, it could be a sign of something more serious and requires immediate medical attention:Suicidal thoughts: There have been reports of depression, suicidal thoughts, and suicide attempts during Mysimba treatment.Loss of consciousness or seizures: Can affect up to 1 in 1,000 people. They are more likely to occur if you take too many tablets, take other medications at the same time, or are at a higher risk of having seizures.Erythema multiforme: Red, itchy spots on the limbs, which can affect the mouth and other parts of the body.Rhabdomyolysis: An abnormal breakdown of muscle tissue that causes severe muscle cramps, muscle pain, and weakness.Serotonin syndrome: A condition that causes changes in your mental status, including hallucinations, agitation, and coma, as well as high temperature, blood pressure, and gastrointestinal issues.Lupus: An autoimmune disorder that affects the skin and organs.How to Manage the Side Effects of MysimbaMany of the most common side effects of Mysimba, like nausea, constipation, and headaches, are mild, temporary, and can be managed at home through a variety of self-care measures. Side effects often improve as your body adjusts to the medication over a few weeks.Some of the common side effects and the ways you can manage them include:Feeling and being sick: Take the Mysimba tablets with food and eat smaller, more frequent meals. Stick to bland foods, like crackers, and avoid spicy, greasy, or fatty foods.Headaches: Drink plenty of water to stay hydrated, get some rest, and take over-the-counter painkillers, such as paracetamol and ibuprofen. Dizziness: Where possible, sit or lie down until the feeling passes and avoid driving or operating machinery if Mysimba makes you feel dizzy.Sleep issues: Take your evening Mysimba dose before dinner rather than at bedtime. Practice good sleep hygiene by keeping to a consistent sleep schedule, turning off screens 1 to 2 hours before bed, and keeping the room calm, cool, and quiet.Constipation: Increase your fibre intake by choosing foods like fruit, vegetables, and wholegrains. Drink plenty of water throughout the day and speak to your clinician about taking laxatives.  Although most side effects of Mysimba are manageable, if you find them challenging or are concerned about them, you should contact your clinician for more advice. Side Effects of Mysimba: Frequently Asked QuestionsMysimba, like all weight loss medications, can cause side effects. The most common are usually gastrointestinal and usually improve as your body gets used to the medication. However, you may have questions about the safety of Mysimba and its active ingredients, so we’ll shed some light on these key concerns here to help you make a more informed choice about your weight loss treatment.Is Mysimba Dangerous?Mysimba is considered safe for most people when it is taken correctly and under medical guidance, but it does carry some risks and can cause side effects, some of which can be serious. Mysimba is a prescription-only medication, and a clinician will assess your suitability before prescribing it. What are Potential Bupropion Side Effects?Bupropion is an antidepressant and can cause a range of potential side effects, including common and rare types. Very common side effects include sleep issues, while common ones include feeling depressed, anxious, or agitated, difficulty concentrating, headaches, shakiness, feeling or being sick, and stomach pain.What are Potential Naltrexone Side Effects?Naltrexone is a prescription opioid antagonist that is used to treat addiction. Common side effects include feeling or being sick, stomach pain, anxiety, nervousness, trouble sleeping, headache, and joint or muscle pain. It is well tolerated, with side effects often mild and usually improving as your body adjusts.How Much Mysimba Should I Take?Mysimba follows a dosage schedule that gradually increases over 4 weeks, reaching a maximum of 2 tablets twice a day. It is important that you follow the dosage schedule and take Mysimba exactly as your clinician has instructed, to ensure you take it safely.The dose is increased over this time to help manage potential side effects and allow your body to adjust to naltrexone and bupropion slowly. Taking the tablets with food also helps minimise stomach irritation and digestive side effects, reducing the risk of nausea and headaches.  {add_product_block(192)} Take the First Steps to a New YouIf you’re looking to lose weight but have found it difficult to do so when relying solely on a healthy diet and regular exercise, a medicated weight loss programme with Prescription Doctor may be the solution. We offer a range of treatments, including Mysimba, Mounjaro, Wegovy, and Nevolat.Our consultation service is simple and straightforward to navigate. With us, there’s no need for lengthy waiting times or potentially awkward face-to-face meetings. Instead, just complete a brief online questionnaire, and our experienced clinicians will review your information to determine whether your chosen treatment is suitable for your circumstances. If not, an alternative may be recommended.Convenience is a core part of service, which is why we deliver your items to your door in discreet packaging. Orders approved before 3pm on a weekday are also dispatched for next-day delivery, so you can access your treatment quickly.We’re here to support you at every stage of your weight loss journey. Our clinicians are available to answer any medical queries and will regularly check in with you to monitor progress and ensure everything is working as intended. You can also find a library of useful information about the various treatments we offer on our website.Ready to begin? Start your weight loss consultation with Prescription Doctor today and let us support you throughout your journey.  SourcesEMC: Mysimba Package Leaflet. EMC (2024): Zyban 150 mg prolonged release tablets.NICE: Naltrexone with bupropion. EMA (2025): Mysimba - referral.EMA (2019): EU Risk Management Plan for Mysimba (Naltrexone HCl/Bupropion HCl). 
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How Long Mysimba Side Effects Typically Last?
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User Reviews and Feedback on Mysimba

Deciding whether to add weight loss medication to your diet and exercise regimen is an important undertaking. This is why it’s a good idea to do as much research as possible about your chosen treatment, including how it works, how to administer it, and the potential side effects.Another essential piece of information is how effective the medication is in helping you reach your goals. Although clinical trials can offer a good indication of this, seeing real-life accounts of how other users have found the treatment is invaluable.Join us as we explore real Mysimba reviews from our customers that appear on our Trustpilot profile. We’ll discover how the treatment has impacted weight loss, side effects, and cravings, so you can make a more informed decision about whether the medication could be right for you.  [medical_form product_id="192" text="START YOUR MYSIMBA CONSULTATION TODAY" type="button"] Is Mysimba Good for Weight Loss?Mysimba is a good option for weight loss when taken alongside a healthy diet and regular exercise. Clinical trials have shown that it can help people lose around 8.1% of their body weight in 56 weeks. Between 13% and 22% of people lose up to 10% of their starting body weight, compared to around 5-6% with a placebo.Since it comes in tablet form, Mysimba is a particularly good alternative to weight loss injections for those who have a phobia of needles. You may also want to switch to the treatment if you haven’t seen much progress with your current medication.As with all weight loss treatments, the effectiveness of Mysimba depends on several factors. These include your starting weight, lifestyle choices, and how your body responds to the medication. Because it was initially licensed to combat addiction, Mysimba is extremely useful for people who struggle with cravings and emotional eating. The Importance of Mysimba Reviews on TrustpilotGathering Mysimba reviews on Trustpilot helps share real-world user experiences, so you can understand how well the treatment reduces appetite and supports weight loss. It also offers insights into the medication’s benefits, such as fewer cravings and increased energy levels, while in turn providing an honest overview of side effects and how people manage them.Here are some aspects of Mysimba treatment that Trustpilot reviews can be really useful for:Effectiveness: Many reviews give real-life insight into how Mysimba supports weight loss, with users sharing how much weight they have lost as well as highlighting the drug’s ability to reduce your appetite and minimise cravings.Common side effects: Several Mysimba users report side effects, particularly at the beginning of treatment, but they usually wear off or improve over time.Holistic benefits: Alongside weight loss, Mysimba users also share that the medication has helped to improve their mental well-being and self-esteem. Some also report that it can improve their mood or motivation, key factors in sticking to a weight loss diet plan.Long-term treatment: Some reviewers report regaining some weight after stopping treatment, but lifestyle changes, such as adopting a healthy diet and engaging in regular exercise, can help counteract this. TrustpilotMysimba Reviews UK: A BreakdownThe section below provides some real Mysimba reviews from UK-based Prescription Doctor customers. It offers valuable insights into how the medication supports weight loss, common side effects, and the importance of pairing the treatment with lifestyle changes that promote health and well-being.In addition, the reviews highlight people’s experiences with our service, so you can understand what you can expect when you choose Prescription Doctor as your weight loss partner.  Mysimba Weight Loss ReviewsMany users report that the medication effectively reduces their appetite and aids in weight loss. Several mention losing weight within the first few weeks of use, feeling fuller quicker, and experiencing a decrease in cravings, particularly for sweets and unhealthy foods.Some patients note immediate effects, while others say it's too early to tell or that they haven't noticed a significant change in appetite or weight. “Wow, I really recommend these tablets. My appetite is very low, which is good, and I am losing weight. Slowly, but my weight is going down. I will order again because it helps me.”Alexandra Mandikova “Going good. Lost 4 lb in first week.”Jacqueline Sutcliffe “I have just started my prescription 4 days ago, and I can honestly say it is curbing my appetite and my thoughts about food. I’m hoping as I get into the weeks, it will continue to benefit me.”Traci Morrow These reviews align with clinical trials showing that Mysimba effectively reduced body weight more frequently than placebo. One study found that the average weight loss over 56 weeks was 5.4%, while others report losses of 8.1%. The studies required participants to engage in lifestyle modifications, emphasising that Mysimba is most effective when combined with diet and exercise changes. {add_product_block(192)} Mysimba Side Effects ReviewsWhile many users do not report significant side effects, a few mention experiencing anxiety, headaches, nausea, and insomnia. One user stopped taking the medication due to its strength and the side effects experienced.Side effects, however, are most likely when you first start Mysimba, but are often not severe enough to put people off continuing with the medication, while some people get no side effects at all.  “It’s good so far, week one, and I have some side effects: slight nausea and slight headaches, but not enough to need pain relief. It’s really helped me lose interest in food. I’m having my two meals a day, and that’s it :) I highly recommend, but I’ve only been on one tablet a day so far; about to move to two.”Isabelle “Seems to be working fine and no side effects.”Tricia Mottram “Very good product when you keep watching what you eat. In the first 4 weeks, I lost 6kg with minimal exercise. Side effects gone after 3rd day.”Joanna Basik Most Mysimba side effects can be managed at home with rest, hydration, and over-the-counter painkillers, and usually resolve within a few days to weeks. If you are finding it difficult to manage them, our clinicians are on hand to discuss your weight loss options, including switching to an alternative weight loss medication.  {add_product_block(192)} Mysimba Tablets Reviews: Lifestyle & CravingsSeveral reviews highlight the importance of combining the medication with a healthy diet and exercise for optimal results. It's not seen as a 'magic pill' but rather as an aid alongside lifestyle changes.Naltrexone and bupropion work by targeting two key brain regions that help regulate your appetite and the rewarding feeling you get when you eat. In doing so, Mysimba reduces your appetite and curbs cravings, helping you lose weight. “Definitely reduced my appetite and the delivery was exceptionally quick!”Amber Watters “Seems to have a mild appetite suppressing effect, not much in the way of side effects of note so far, definitely not a magic pill but useful along with careful diet and exercise.”Jason Reid “Mysimba reduced my feeling of hunger, and I’m still in the first week.”Rihab Halloum By reducing hunger and appetite, Mysimba can make weight loss easier than dieting alone. It’s important to remember that Mysimba is not an overnight solution and requires effort and adherence to lifestyle changes for the best results. {add_product_block(192)} Prescription Doctor Mysimba ReviewsSelecting Mysimba is just one part of your weight loss journey. For success, you need to choose a partner that will support you along the way, with clinicians available to give advice and help you overcome any potential obstacles. At Prescription Doctor, we are proud of the service we provide our patients to ensure they receive the support they need.Our service is frequently praised for its quick and efficient service, with many patients appreciating its fast delivery and easy purchase process. Most users are satisfied with the product and service, with several planning to continue using the medication or recommending it to others. “I find Mysimba has really helped me stay on track with my healthy eating. It does not lower your appetite; it takes the craving away in your brain. So if you’re a chocoholic or a binge eater, this would be very helpful. You would have to follow a diet programme of healthy eating alongside these pills. I’ve tried every diet on the market, but my cravings have always let me down. I feel very safe using Prescription Doctor online; they have a good helpline if I need any extra information.”Anonymous “Very helpful doctor and customer service. Very quick delivery. I will be using it in the future.”Maria Huertas “Excellent professional service!!”Zoe Access to a responsible and encouraging service whose clinicians can provide clear guidance and advice when you’re taking Mysimba. That’s why many people have chosen to partner with Prescription Doctor for their weight loss journey. {add_product_block(192)} A Library of Useful InformationThese real Mysimba reviews can give you a valuable insight into how effective it can be and how it may help you, but you might now be looking for a deeper understanding of how it works and what to expect when you start treatment.If you’d like to get a better idea of how naltrexone and bupropion work to suppress your appetite, our ‘How does Mysimba work?’ article breaks down how they act on neurotransmitters, such as dopamine and noradrenaline, to leave you feeling less hungry.If you’re new to weight loss medication, you can learn how to take Mysimba effectively and how long it takes to work in our dedicated guides.One of the hottest topics surrounding weight loss medications is their potential side effects, and our dedicated guide can give you a greater understanding of Mysimba’s side effects, like nausea and headaches, and how long they may last. If you’re undecided about whether Mysimba is right for you, we compare Mysimba vs. Saxenda to help you make an informed decision.Whether you’re looking for further guidance to help you harness the full benefits of Mysimba or are still weighing up your options, our expanding library can provide clarity, reassurance, and confidence throughout your weight loss journey.Dedicated Weight Loss Support from Prescription DoctorIf you’re thinking about embarking on a medicated weight loss programme, Prescription Doctor is here to help. We’ve supported countless individuals in achieving their goals, and we’re ready to do the same for you.Our service is built entirely around your requirements. With us, you can start a consultation at any time from the comfort of your own home. Our specialist clinicians will then review your information to determine whether your chosen treatment is suitable for you or, if not, offer an alternative. Orders approved before 3pm on a weekday are also eligible for next-day delivery. It’s that straightforward.After you’ve started treatment, our team will regularly check in with you to monitor progress and ensure everything is working successfully. You can also contact us whenever you have a query or require a bit more information. We are here for you.Ready to get started? Begin a Mysimba consultation with Prescription Doctor today.  SourceseClinical Medicine (2022): The relationship between early weight loss and weight loss maintenance with naltrexone-bupropion therapy.EMC (2023): Mysimba 8 mg/90 mg prolonged-release tablets. European Medicines Agency (2025): Mysimba.Pharmacological Research (2014): Naltrexone/bupropion for obesity: An investigational combination pharmacotherapy for weight loss.
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User Reviews and Feedback on Mysimba
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Mysimba UK Obesity Statistics

The UK has the fourth highest obesity rate in Europe, according to a WHO study, with almost 27% of adults considered to be obese in 2018 (1). This has led to an increased demand for weight loss services, such as nutritional advice and personalised programmes that address long-term changes to eating habits and lifestyle. There are now a variety of weight loss options available in the UK, including specialist clinics, online programmes, and NHS-funded choices. Gym memberships, dietitians, and healthy eating apps are all popular choices that can offer tailored guidance and advice. In addition to traditional diets, bariatric procedures and surgery are available from NHS providers. These resources can be beneficial to those who qualify and may otherwise struggle to lose a significant amount of weight without assistance.The popularity of health and fitness, combined with improved accessibility to information and resources, has made it easier for people to assess their health. There is growing evidence to support the use of mindful eating practices in aiding sustainable lifestyle changes and achieving a healthier weight. These practices, such as mindful snacking, mindful eating, and mindful cooking, can help introduce more nutritious eating habits and reduce the frequency of regular dieting.Overall, there is an increasing demand for weight loss services in the UK. From traditional diets to mindfulness practices, individuals now have access to a wide range of resources to help them reach a healthier weight.Mysimba is currently available online in the UK. You can request Mysimba treatment via our online consultation process.
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Mysimba UK Obesity Statistics

Treatment information

  • Product Name: Mysimba
  • Manufacturer: Orexigen Therapeutics
  • Active Ingredient(s): Naltrexone hydrochloride and bupropion hydrochloride
  • Administration: Oral
  • Presentation: Tablet
  • Available Strength: 8mg/90mg
  • Exemption: Prescription Only
  • Application: Adults with a BMI above 30
  • Dosage: Take as prescribed by the doctor
  • Alcohol Consumption: Avoid or limit alcohol consumption
  • When Pregnant: Do not take Mysimba during pregnancy. Speak to your doctor for further advice.
  • When Breastfeeding: Do not take Mysimba while breastfeeding. Speak to your doctor for further advice.
  • Price: 109.99 GBP
  • https://www.prescriptiondoctor.com/storage/product_images_th/mysimba.jpg
Click here to view the Mysimba - Patient Information Leaflet

Authored By

Cong

Cong Cao

Medical Content Writer
Cong is a UK-registered pharmacist and a graduate of The University of Manchester, with diverse experience across hospital, community and industry pharmacy settings.

Published on: 17/12/2019 Re-Published on: 14/08/2025

Reviewed By

Mohamed Imran Lakhi

Mohamed Imran Lakhi

MPharm - Lead Pharmacist
Imran Lakhi is the superintendent pharmacist and founder at Prescription Doctor. He has been at the core of our team.

Reviewed on: 14/08/2025

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