Xenical (Orlistat)

What is Xenical?

Xenical is a medication used to treat obesity. Unlike some popular products that affect your mood or hunger sensations, Xenical 120 mg capsules work by blocking the digestion of certain dietary fats, allowing them to pass through your body instead.

The medication works locally in the gut without affecting your mood or brain chemistry, making it a popular long-term solution. When taken alongside a healthy diet and regular exercise regimen, Xenical has been proven to facilitate weight loss.

Because Xenical is a branded form of orlistat, it may also be referred to by its active ingredient name in medical settings. Both are equally effective at blocking fat absorption; the main difference is the manufacturer and the name on the box. You can buy orlistat both as Xenical and a generic medication, and also as an over-the-counter treatment known as Alli.

How Does Xenical Work for Weight Loss?

Xenical weight loss capsules work by blocking an enzyme called lipase, which is necessary for breaking down dietary fat into absorbable molecules. When active, the medication prevents around 30% of the fat you eat from being digested. This results in fewer calories being absorbed per meal, without needing drastic cuts in the volume of food you eat.

Unlike alternative weight loss treatments such as Mounjaro and Wegovy, which mimic naturally occurring hormones in the brain, Xenical only targets the digestive system, earning it the classification of a ‘peripherally acting anti-obesity agent’.

Xenical capsules only work if you have eaten a meal that contains fat. If your food has no fat content or you skip a meal completely, there’s no need to take a capsule as it will have no effect.

How Long Does Xenical Take to Work?

When taking Xenical weight loss capsules alongside a reduced-fat, calorie-controlled diet, you may notice subtle changes within the first few weeks of treatment. More significant results tend to build over 8 to 12 weeks when taken consistently with each meal containing fat.

Some promising signs that the medication is working include feeling lighter, feeling less bloated, or having slightly looser clothing. These can occur early on in treatment, giving you the confidence you need to progress with your journey. Remember, though, products like Xenical are not designed to be fast-acting solutions. Instead, they generate sustained, long-lasting results.

How Long Does Xenical Last?

Because Xenical capsules are designed to only last for one meal, you will need to take one every time you have a meal that contains fat. You can take up to 3 capsules each day. Xenical will continue working for as long as you take it. The medication has a half-life of around 1-2 hours.

Xenical Weight Loss Results

Xenical’s effectiveness for weight loss has been extensively studied. A four-year trial found that nearly half (41%) of Xenical users lost 10% or more of their starting body weight within one year of taking the medication, compared to just 21% of those using a placebo. In the same trial, 60% of participants taking Xenical experienced a weight loss of 5% or more from baseline within 12 weeks alone.

Meanwhile, pooled results from several two-year studies revealed that the average weight-loss difference between people taking Xenical capsules and those not taking them was approximately 3.2 kg in the first 12 months of treatment. The majority of trials were randomised, double-blind, placebo-controlled experiments, meaning neither the participants nor the researchers knew who received Xenical and who received a placebo. This is known as the ‘gold standard’ in clinical research.

An additional benefit of Xenical was observed in the XENDOS study, which followed participants over four years. Those taking Xenical alongside lifestyle changes were less likely to develop type 2 diabetes, with 6.2% doing so compared with 9.0% of those taking a placebo, a difference of 2.8 percentage points.

How Much Weight Can You Lose on Xenical in a Month?

Results vary from person to person, and the amount of weight you lose depends on how well you stick to the diet and lifestyle changes recommended alongside your treatment.

In clinical trials, 60% of people taking Xenical had lost at least 5% of their starting weight after 12 weeks, compared with 35% of those taking a placebo. Your doctor will usually stop your Xenical treatment at 12 weeks if you haven't lost at least 5% of your starting weight, as this suggests the medication isn't having the intended effect for you.

Xenical Prescription Criteria

To be eligible for Xenical, you must:

• Be over 18 years old
• Have a BMI of 30 or more, or 28+ with conditions such as high blood pressure or type 2 diabetes
• Not pregnant or breastfeeding
• Not have chronic malabsorption issues or cholestasis (a liver condition)

How to Take Xenical for Best Results

Xenical comes in 120 mg capsules to be taken with meals. Ensure you swallow the capsule whole, without breaking it. For optimal weight loss results, take them with meals that contain a small to moderate amount of fat, such as lean protein or healthy oils. If you miss a meal or eat a meal that contains no fat, omit the Xenical dose, as it will not have any therapeutic effect.

It’s essential that your diet is nutritionally balanced, with approximately 30% of calories from fat, ideally distributed evenly across three meals. Aim to reduce your intake of high-fat foods, such as fried items, full-fat dairy, and fatty cuts of meat.

Xenical capsules should be taken in conjunction with a low-calorie diet and regular exercise. Consistently, evidence shows that combining weight-loss medication with healthy eating and exercise leads to greater weight loss than using either approach alone.

Xenical Dosage Information

The standard dose for Xenical is one 120 mg capsule, taken up to three times per day. Ideally, this is done just before, during, or within one hour after a main meal that contains fat. Most people take Xenical capsules for 12 weeks initially. If you’ve lost at least 5% of your body weight at this point, treatment can continue.

What if I Miss a Dose of Xenical?

If you miss a dose of Xenical and it has been less than an hour since your last fat-containing meal, take one capsule as soon as you remember. If more than 1 hour has passed, skip the missed dose and wait until your next meal to take a capsule as usual. Do not double-dose Xenical.

If You Take Too Many Xenical Capsules

If you take more Xenical capsules than you should, or somebody else accidentally swallows your medication, it’s essential to consult a clinician or doctor as soon as possible. You could also visit your nearest accident and emergency department.

How Long Should I Take Xenical For?

For many, Xenical becomes part of a longer-term weight management strategy. It is considered safe for up to 1 year of use, though this timeframe can be extended, provided you continue to see benefits and don’t experience side effects. Regular check-ins with your prescriber can help you track progress and ensure the medication is supporting your weight loss goals.

Xenical Side Effects

Xenical is generally well-tolerated; however, it can cause side effects, particularly when consumed in excessive amounts of fat. Here are some Xenical side effects that you might experience:

It’s important to note that the above is not an exhaustive list of potential Xenical side effects. For a more thorough understanding, please refer to the Patient Information Leaflet included with the medication.

How to Manage Xenical Side Effects

Most Xenical side effects settle once your body adjusts, or if you reduce your fat intake. Common issues, such as oily stools and excess gas, tend to subside within a few days to a few weeks, especially if you adhere to a lower-fat diet. Eating smaller, leaner meals can also help.

To minimise side effects, try spreading your fat intake evenly across meals and avoiding greasy or fried foods. Drinking plenty of water, eating more fibre, and choosing lean protein sources can also help regulate digestion.

If these symptoms persist or worsen, consult your clinician.

Xenical Interactions and Warnings

Xenical capsules are effective weight loss aids; however, they may not be suitable for everyone. The medication can interfere with other treatments you are taking, or not be safe to take if you have certain underlying medical conditions. It’s therefore important to have a clear understanding of what you could expect before starting treatment.

Avoid Xenical if you:

• Have cholestasis (a liver condition) or chronic malabsorption syndrome
• Are allergic to any ingredients in the capsule
• Are under 18 years old
• Have a diagnosed eating disorder
• Are taking certain medications such as ciclosporin

Does Xenical Interact with Other Medications?

As with all medications, Xenical can interact with other treatments, reducing their effectiveness. You should especially inform your doctor if you are taking medications such as:

• Epilepsy treatments
• Amiodarone, a heart medication
• Ciclosporin for rheumatoid arthritis
• HIV treatment
• Warfarin and other anticoagulant drugs
• Levothyroxine and/or iodine salts
• Acarbose, a diabetes treatment
• Medication for mental health disorders

When completing a medical consultation, it is essential to detail all treatments you are currently taking, including over-the-counter medications and herbal remedies.

Precautions Before Taking Xenical

Before starting Xenical, there are a few things worth knowing about how it works and what to expect.

• If you lose weight, your doctor may need to adjust the dose of other medicines you take, such as treatments for diabetes or high cholesterol
• Xenical can cause changes to your bowel habits, such as loose or oily stools, as the undigested fat passes through your body. This is more likely if a meal is high in fat, so try to spread your fat intake evenly across your three main meals
• If you have kidney disease, Xenical may increase your risk of kidney stones. Let your doctor know if you have any kidney problems
• If you take hormonal contraception, severe diarrhoea while on Xenical could affect how well it works, so it's worth using an additional method of contraception (see below)

Xenical and Contraception

Xenical works by blocking some of the fat in your food from being absorbed. One possible side effect of this is diarrhoea, and if it becomes severe, it can affect how well your contraceptive pill is absorbed into your body.

This means there's a chance the pill may not protect you from pregnancy as effectively during a bout of severe diarrhoea. To stay protected, it's recommended you use an additional method of contraception, such as condoms, if you experience severe diarrhoea while taking Xenical.

If you're unsure what counts as severe or how long to use extra protection, check with your doctor or pharmacist.

What are the Alternatives to Xenical?

There are several weight loss treatments available, both in tablet and injectable forms. At Prescription Doctor, we offer the following alternatives to Xenical:

• Mounjaro: A dual-action, once-weekly injection containing the active ingredient tirzepatide
• Wegovy: A subcutaneous injection with the active ingredient semaglutide. Also taken once per week
• Nevolat: The generic form of Saxenda. This injection is administered once per day
• Mysimba: Weight loss tablets that reduce cravings and emotional eating
• Alli: An over-the-counter version of orlistat, available in 60 mg capsules
• Orlistat: The generic form of Xenical, taken in capsule form
• Wegovy Pill: The first oral GLP-1 medication in the UK. Contains the active ingredient semaglutide and is taken once daily

Frequently Asked Questions About Xenical 120mg Capsules