Mysimba

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 alongside a healthy diet and regular exercise.

Containing active ingredients 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.

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 how it works. Unlike incretin-based injections such as Wegovy or Mounjaro, Mysimba is taken as a tablet and acts directly on the brain's appetite and reward pathways. In practice, this means it targets the signals that drive hunger and the urge to reach for food, rather than working through the gut or slowing digestion. It also works differently to medicines like Xenical or Alli, which reduce the amount of dietary fat your body absorbs rather than acting on appetite.

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 for reasons 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 met, our clinicians will 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. Naltrexone takes about 1 day to clear from the body after your last dose, whereas bupropion takes around 4 to 5 days. At the start of your treatment, you'll get a pack of 112 Mysimba tablets, which lasts around 4 weeks once you reach the full dose.

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 which drug (either Mysimba or a placebo) each participant receives.

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.

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 is preferable as it 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 Dosage Information

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 among four tablets.

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

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.

If You Take Too Many Mysimba Pills

If you take too many Mysimba tablets, you may be more likely to experience side effects. Contact your doctor or your nearest accident and emergency department immediately.

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 pregnant or breastfeeding
• Not taking certain antidepressants or opioid painkillers

To make the most of your weight loss journey, it's recommended that you 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.

Mysimba Side Effects and Cautions

Most people tolerate Mysimba well, but it's worth knowing what to expect. Below you'll find the common side effects, the rarer but more serious ones, and who should take extra care with this medicine.

Side Effects of Mysimba

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

It’s important to note that the above is not an exhaustive list of Mysimba side effects. Please refer to the Patient Information Leaflet for further details. If you do experience adverse reactions, you can also report them via the MHRA’s Yellow Card Scheme.

Serious Side Effects of Mysimba

Most side effects are mild and settle down over time, but a small number of people experience more serious reactions. Contact your doctor immediately or go to A&E if you notice any of the following:

• Seizures or fits: rare, affecting around 1 in 1,000 people, and more likely in the first few weeks of treatment or after a dose increase. If this happens, Mysimba must not be restarted.
• Severe skin reactions: a rash, blistering, or peeling skin, sometimes with fever or sore eyes, can be signs of a serious condition such as Stevens-Johnson syndrome.
• Liver problems: yellowing of the skin or eyes, dark urine, or unusual tiredness can indicate liver injury and may mean treatment needs to stop.
• Mood changes or suicidal thoughts: some people experience new or worsening low mood, agitation, or thoughts of self-harm, particularly early in treatment or after a dose change.
• Severe allergic reactions: swelling of the face, lips, tongue or throat, chest pain, hives, or sudden difficulty breathing.
• A sharp rise in blood pressure: most likely during the early weeks of treatment.

These reactions vary in frequency but require prompt attention. If in doubt, seek medical advice without delay.

Mysimba Warnings and Interactions

Although Mysimba tablets for weight loss are an effective medication, they are not suitable for everyone. The treatment may interact with other medicines you are taking, or not be safe to use if you have certain medical conditions. It’s therefore essential to have a clear understanding of what to expect before you proceed.

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)

Please note that this is not a comprehensive list; certain medicines should also be avoided, such as monoamine oxidase inhibitor antidepressants (MAOIs - a specific class of antidepressant) or if you’re undergoing alcohol detox. More information can be found within the Patient Information Leaflet.

Precautions with Mysimba Tablets

Mysimba isn't suitable for everyone, so it's worth speaking to your GP or prescriber first if any of the following apply to you. They can advise whether Mysimba is appropriate or whether closer monitoring is needed.

• Head injury or heavy alcohol use: both increase the risk of seizures while taking Mysimba.
• Diabetes: Mysimba can lower blood sugar, which may in turn increase seizure risk. Your medication may need reviewing.
• Heart disease: including angina, or a history of heart attack or stroke.
• Mental health history: such as mania, panic attacks, or other psychiatric conditions, as symptoms can occasionally worsen during treatment.
• Age over 65: you may be more sensitive to dizziness and other nervous system effects. Mysimba isn't recommended for those over 75.
• Kidney or liver problems: reduced function can affect how Mysimba is processed, so a lower dose may be needed.
• Lactose intolerance: Mysimba tablets contain lactose, so they aren't suitable if you have a rare inherited condition that affects how your body handles it.

Mysimba can also cause dizziness or, rarely, loss of consciousness. Take care when driving or using machinery, especially when starting treatment or after a dose increase.

Hypersensitivity Reactions

Stop taking Mysimba and contact your doctor straight away if you notice signs of an allergic reaction. These include swelling of the face, lips, tongue, or throat; difficulty swallowing or breathing; dizziness; fever; rash; joint or muscle pain; itching; or hives.

Serious skin reactions have also been reported with Mysimba, including Stevens-Johnson syndrome and acute generalised exanthematous pustulosis (AGEP). Both can cause blistering, peeling skin, or a widespread rash with fever, and need urgent medical attention.

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 that may influence treatment. Completed 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 if your order is cancelled for any reason.
• Follow-up: Regular check-ups are scheduled once you have started your 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 must determine whether it’s suitable for your circumstances before issuing treatment, a process usually carried out during 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 through certain specialist weight loss clinics under specific criteria.

Can I Switch to Mysimba from Another Weight Loss Treatment?

Yes, but you’ll usually need a gap between stopping your current weight loss treatment and starting Mysimba. How long this needs to be depends on which medication you're switching from and your individual circumstances, so your clinician will confirm the right timing during your consultation.

The interval between treatments is partly determined by a medicine's 'half-life', the time it takes for the drug concentration in your body to halve, which varies from one treatment to the next. Mounjaro, for example, has a half-life of around 5 days, whereas Nevolat's is much shorter, at around 13 hours. Always consult with your clinician before switching, as they can determine whether the replacement medication is suitable for your specific circumstances and advise you on how to 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 available as injection pens, while Xenical and Alli are available as tablets. How you prefer to take your medication could be a factor in whether you decide to switch or not.

Frequently Asked Questions About Mysimba Tablets