If you are researching orlistat, you may be wondering whether taking two capsules at once could improve your results, or whether you can use orlistat after having your gallbladder removed. This guide explains what you need to know based on clinical guidance and available evidence.
The short answer is that taking more than your prescribed dose is not expected to improve weight loss and may increase the risk of side effects. If you have had your gallbladder removed, orlistat may still be an option for some people, but your healthcare professional will need to consider your individual circumstances before recommending treatment.
What Is Orlistat and How Does It Work?
Orlistat is a weight loss medicine that works differently from injectable treatments such as GLP 1 receptor agonists. Instead of affecting appetite hormones, it works in the gut by blocking enzymes called gastrointestinal lipases, which break down fat from food.
By reducing fat absorption, orlistat means that some of the fat you eat passes through the body without being absorbed. It is designed to be used alongside a reduced calorie, lower fat diet, as the amount of fat in your meals can affect both how well it works and the likelihood of side effects.
Orlistat is available as:
- Generic orlistat 120mg
- Branded Xenical 120mg
- Lower strength over the counter orlistat 60mg, sold as Alli 60mg
Because orlistat works on dietary fat rather than appetite control, following the recommended diet plan is an important part of treatment.
Who Is Orlistat Suitable For? NICE Eligibility Criteria
NICE guidance recommends orlistat as part of a wider weight management plan for adults who meet certain BMI criteria. It is not intended to be used as a standalone weight loss treatment.
Orlistat may be considered for adults with:
- A BMI of 28 kg/m2 or higher with an additional weight related health condition, such as type 2 diabetes, high blood pressure or sleep apnoea
- A BMI of 30 kg/m2 or higher without needing an additional health condition
Your healthcare professional will assess whether orlistat is suitable based on your health, medical history and weight management goals.
NICE guidance recommends reviewing treatment after 3 months. Treatment is generally continued only if there has been meaningful weight loss, usually at least 5% of your starting body weight. Continuing treatment beyond 12 months is a decision made between you and your prescriber, taking into account the benefits, side effects and your individual circumstances.
This review process is why a clinical assessment is important, even though lower strength orlistat products are available without a prescription.
Treatment suitability depends on an individual clinical assessment. This medicine should only be used under the guidance of an appropriately qualified healthcare professional, and results can vary between individuals.
Can You Take 2 Orlistat Capsules at Once?
No. Taking two 120mg orlistat capsules together is not recommended and has not been shown to improve weight loss results. Orlistat is designed to be taken at the recommended dose, and increasing the amount yourself is unlikely to provide additional benefits.
Taking more than the recommended dose may increase the chance of side effects, including oily stools, bowel urgency and stomach discomfort. If you feel that orlistat is not helping enough, speak with your prescriber or pharmacist. They can review your treatment plan and discuss whether any changes are needed rather than adjusting your dose yourself.
The Standard Orlistat Dosing Pattern
For general information, orlistat 120mg is usually taken as one capsule with each main meal that contains fat, up to three times a day. It can be taken immediately before, during, or up to one hour after a meal.
If you skip a meal or your meal does not contain any fat, you would usually skip that dose rather than taking it separately.
This is general dosing information and does not replace advice from your prescriber or the patient information leaflet provided with your medicine. Always follow the dose instructions given to you and do not take more than the recommended amount.
Orlistat Without a Gallbladder: What You Need to Know
Taking orlistat after gallbladder removal (cholecystectomy) is not always a simple yes or no. Your healthcare professional will need to consider your individual situation before recommending treatment.
After gallbladder removal, bile flows continuously from the liver into the small intestine instead of being stored and released when you eat. This can affect how some people digest fats, and some people may notice changes such as looser stools or reduced tolerance for high fat meals.
Orlistat works by reducing the amount of fat absorbed from food. Because some of its side effects, such as oily stools, increased bowel movements and bowel urgency, are linked to unabsorbed fat passing through the digestive system, some people who have had their gallbladder removed may notice these effects more strongly.
Gallbladder removal itself is not the same as conditions where orlistat should not be used, such as chronic malabsorption syndromes or cholestasis (a condition affecting bile flow). However, your prescriber should know about your surgery history, digestive symptoms and how you currently tolerate fatty foods before deciding whether orlistat is suitable for you.
If you have had your gallbladder removed and are considering orlistat, mention this during your clinical assessment. Your healthcare professional can review your health history and help decide whether this treatment is appropriate for you.
Treatment suitability depends on an individual clinical assessment, and orlistat should only be used under the supervision of an appropriately qualified prescriber.
What Does the Evidence Show for Weight Loss With Orlistat?
When taken at the recommended dose alongside dietary changes, orlistat has been shown in clinical studies to support greater weight loss compared with diet changes alone. Research suggests that people taking orlistat may lose more weight on average than those taking a placebo when both groups follow a reduced calorie diet.
Orlistat generally leads to more modest average weight loss compared with injectable weight loss medicines such as GLP 1 receptor agonists. This is why NICE guidance and clinical practice often consider orlistat as one of several treatment options within a wider weight management plan for people who meet the eligibility criteria.
Weight loss results can vary from person to person. NICE recommends reviewing treatment after 3 months, with continued use generally considered when there has been at least 5% loss of initial body weight. This review helps ensure that treatment remains suitable and beneficial based on your individual response.
Orlistat, Xenical and Alli Compared
| Product | Strength | Availability | Notes |
|---|---|---|---|
| Orlistat (generic) | 120mg | Prescription | Same active ingredient and dose as Xenical, generally lower cost |
| Xenical | 120mg | Prescription | Branded version of orlistat, identical active ingredient |
| Alli | 60mg | Available over the counter | Lower strength, licensed for adults with a BMI of 28 or more |
| Orlos | 120mg | Prescription | A branded generic version of orlistat |
This comparison is for general information only and does not suggest that one product is more effective than another at the same strength, since the active ingredient is identical across the 120mg options. The right option and strength depend on individual clinical circumstances.
Orlistat Pricing in the UK
Pricing varies by provider, pack size and product selected and by whether you choose generic orlistat, branded Xenical, or the lower-strength Alli.
TABLE: Illustrative Pricing
| Product | Typical starting price | Notes |
|---|---|---|
| Orlistat 120mg | From around £15 to £17 for a 2-week supply | Larger packs generally reduce the cost per capsule |
| Xenical 120mg | Priced at a premium to generic orlistat | Same active ingredient and dose |
| Alli 60mg | Available at a lower strength price point | Lower strength than prescription orlistat |
Prices change regularly and vary by provider and pack size. Always confirm current, live pricing at checkout rather than relying on figures from static content, and check whether any advertised discount code is still valid.
Common Side Effects of Orlistat
The side effects of orlistat are closely linked to the amount of fat in your meals. This is because orlistat works by reducing the amount of dietary fat your body absorbs, and the unabsorbed fat passes through your digestive system.
The most common side effects are digestive and may include:
- Oily or fatty stools
- Oily spotting
- Diarrhoea
- Increased urgency to use the toilet
- Wind
- Stomach discomfort or pain
Some people may experience sudden urges to use the toilet, especially after eating a meal higher in fat. These effects are often more noticeable during the first few weeks of treatment and may improve as your body adjusts and you follow a lower fat diet alongside orlistat.
Although less common, some side effects need medical attention. Seek urgent medical help if you experience signs of an allergic reaction, such as swelling of the face, lips or throat, difficulty breathing, or a widespread itchy rash.
Rare cases of serious liver problems have been reported in people taking orlistat. Speak to a doctor promptly if you notice symptoms such as loss of appetite, itching, yellowing of the skin or eyes, dark urine, or pale stools.
Rare reports of kidney problems, including oxalate nephropathy and kidney stones, have also been linked with orlistat, particularly in people with certain risk factors such as a history of kidney stones or reduced kidney function. This is why your medical history is an important part of the clinical assessment before starting treatment.
If you experience ongoing or troublesome side effects, speak with your prescriber or a healthcare professional. They can review your treatment and diet rather than making changes to your dose yourself.
Who Should Avoid Orlistat, or Take Extra Care
Before starting orlistat, your healthcare professional will review your medical history to check whether it is suitable for you.
Extra care may be needed if you have:
- Eating disorders: Orlistat is generally not recommended for people with eating disorders such as anorexia nervosa or bulimia, as it may not be suitable for those circumstances.
- Pregnancy and breastfeeding: Orlistat is not usually recommended during pregnancy, and there is limited information available about its use while breastfeeding. Speak with your doctor or healthcare professional if you are pregnant, planning pregnancy, or breastfeeding.
- Malabsorption conditions or cholestasis: Orlistat is not suitable for people with chronic malabsorption syndromes or cholestasis, a condition that affects bile flow.
- A history of kidney stones: People with a history of kidney stones, particularly calcium oxalate stones, may need additional consideration before starting treatment.
- Underactive thyroid (hypothyroidism): Untreated hypothyroidism should be assessed and managed before starting orlistat, as thyroid problems can contribute to weight gain. Orlistat may also affect the absorption of thyroid medicines, so your healthcare professional may need to review your treatment.
This is general safety information and does not replace individual medical advice. Always discuss your medical history, current medicines and any concerns with your doctor or healthcare professional before starting orlistat.
Orlistat and Other Medicines: Interactions to Know About
Because orlistat reduces the amount of fat your body absorbs from food, it can also affect how your body absorbs certain medicines and vitamins. Before starting orlistat, tell your doctor or pharmacist about all the medicines, supplements and vitamins you are taking, including:
- Levothyroxine, used to treat an underactive thyroid: Orlistat may reduce how much levothyroxine your body absorbs. Your doctor may advise taking these medicines several hours apart and monitoring your thyroid function more closely after starting orlistat.
- Cyclosporine, an immune suppressing medicine: Taking cyclosporine and orlistat together may affect cyclosporine levels in the blood. If both medicines are needed, your doctor may advise taking them several hours apart and monitoring your treatment more closely.
- The combined oral contraceptive pill: Severe diarrhoea, which can occur with orlistat, may affect how well the contraceptive pill works. Check the advice provided with your contraceptive pill and speak to a healthcare professional if this happens, as additional contraception may be needed.
- Fat soluble vitamins (A, D, E and K) and beta carotene: Orlistat can reduce the absorption of these vitamins from food. Your doctor or pharmacist may recommend a multivitamin supplement, usually taken at a different time of day from your orlistat dose.
This is not a complete list of medicines that may interact with orlistat. Always tell your doctor or pharmacist about any prescription medicines, over the counter medicines, vitamins or supplements you are taking.
Diet While Taking Orlistat
Diet plays an important role when taking orlistat because both its effects and side effects are linked to the amount of fat in your meals.
Orlistat is usually taken alongside a reduced calorie, balanced diet spread across around three main meals each day. Keeping meals moderate in fat can help you manage treatment and may reduce digestive side effects.
Some practical tips include:
High fat foods, fried foods and fatty cuts of meat are more likely to cause digestive side effects. Choosing leaner cuts and cooking methods that use less added fat may help.
Look out for hidden sources of fat in foods such as salad dressings, sauces and processed foods, not just obvious sources like meat and cooking oils.
A balanced diet that includes vegetables, wholegrains and lean sources of protein can support your overall weight management plan while taking orlistat.
If you eat a meal that contains no fat, or skip a meal completely, the corresponding orlistat dose is usually missed because there is no dietary fat for the medicine to act on.
Regular physical activity alongside dietary changes can support your overall weight management plan. Orlistat is intended to be used as part of a wider lifestyle approach rather than as a replacement for healthy eating and exercise.
The aim is not to remove fat from your diet completely, as some fat is needed for a balanced diet. Instead, the focus is on keeping fat intake moderate at each meal to support your treatment and day to day comfort.
When to Stop Taking Orlistat
In line with NICE guidance, orlistat is generally reviewed after 3 months of treatment. Continued use is usually considered when there has been at least 5% loss of initial body weight, and continuing treatment beyond 12 months is a decision made with your prescriber based on your individual progress, benefits and treatment goals.
You should also stop taking orlistat and seek medical advice if you experience signs of an allergic reaction, symptoms that may suggest liver problems, or if you become pregnant while taking it.
If you are not seeing the results you expected during your treatment review, speak with your prescriber about your options. They can review your overall weight management plan and advise whether any changes are needed. Do not take more than the recommended dose.
Getting Orlistat Online: What the Process Involves
Getting orlistat online follows a clinical assessment process to help ensure the treatment is suitable for you.
- Complete an online clinical assessment You will be asked about your BMI, medical history, any relevant surgical history such as gallbladder removal, and any medicines you are currently taking.
- Clinical review by a qualified UK prescriber An appropriately qualified UK prescriber will review your information to check whether orlistat, or another treatment option, may be suitable based on your individual circumstances and NICE aligned criteria. If approved, a private prescription can be issued.
- Dispensing from a GPhC registered pharmacy If prescribed, your medication will be dispensed by a GPhC registered pharmacy and delivered to your chosen address.
