Orlistat (Xenical, alli) hard capsules to help weight loss. Available to buy online from Dr Fox.

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Buy orlistat online in UK

How to order orlistat (Xenical/alli) online for UK delivery:

  1. Read medical information about weight loss
  2. Answer medical questions to check for eligibility
  3. Reviewed by doctors - posted from UK pharmacy (tracked 24hr service)


Weight loss capsules Quantity Cost
Orlistat 120mg (generic) 42 capsules £15.50
Orlistat 120mg (generic) 84 capsules £31.10
Orlistat 120mg (generic) 168 capsules £59.90
Orlistat 120mg (generic) 252 capsules £89.90
Xenical (orlistat 120mg) 42 capsules £26.50
Xenical (orlistat 120mg) 84 capsules £40.20
Xenical (orlistat 120mg) 168 capsules £79.90
Xenical (orlistat 120mg) 252 capsules £118.00
alli (orlistat 60mg) 84 capsules £36.00
alli (orlistat 60mg) 168 capsules £74.00
alli (orlistat 60mg) 252 capsules £104.00

Price match guarantee
Prescription issued online - small prescription fee per order.

Prescription fees

Dr Fox supplies medicine on prescription and charges a small prescription fee based on the order value of each prescription.

Prescriptions are issued by our doctors online and sent electronically to our pharmacy.

Order value Prescription fee
up to £10 £1.00
up to £20 £2.00
up to £40 £3.00
over £40 £4.00

If you have your own private paper prescription please post to our pharmacy (details).

Dr Fox prices are 25%–50% lower than other UK online clinics.

Delivery charges

UK delivery only: £2.90 per consultation via Royal Mail Tracked 24 Signed For (1-2 working days with tracking).

Parcel forwarding services are not permitted. Use only UK home or work delivery address.

Returns and refunds - unwanted items can be returned within 14 working days for a full refund.

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About orlistat

  • Orlistat 120mg is a prescription-only capsule to help overweight or obese adults lose weight.
  • Usually taken 3 times a day with meals.
  • Lower strength 60mg orlistat available OTC (over the counter).
  • Available as Xenical, alli, Orlos, and generic orlistat.
  • Read the patient leaflet for a full list of side effects, cautions, and interactions with other drugs.

Orlistat 120mg (Xenical) and orlistat 60mg (alli)

Orlistat hard capsules for taken for weight loss in adults. The active ingredient is orlistat which reduces the absorption of fat.

  • Dr Fox supplies orlistat 120mg (Xenical) for people with a BMI over 30.
  • Dr Fox supplies orlistat 60mg (alli) for people with a BMI over 28.

Body Mass Index

The words 'overweight' and 'obese' are medical terms, defined by body mass index, relating to the health risks from having too large fat stores. The World Health Organisation considers obesity to be a chronic disease.

The Body Mass Index (BMI) is a calculation, combining weight and height, which gives an indication of whether a person is in the healthy or overweight zones. However, it is not a perfect tool, as muscle mass, either very muscular (e.g. athletes) or very little muscle mass (e.g. muscular dystrophy), distorts the figures. The standard BMI zones are also less applicable to many ethnic minority populations having been originally developed in white American and European men.

Weight BMI kg/m2
Underweight < 18.5
Healthy weight 18.5-25
Overweight 25-30
Obese 30-40
Severely obese > 40
BMI calculator

A better tool for assessing health risks related to excess fat is the waist size measurement, which is especially helpful when the BMI is between 25 and 35. According to NICE, men's waist size should be below 94cm (37 inches) and women should be below 80cm (31½ inches). Again ethnicity plays a part, so these are less reliable outside the white population.

How does orlistat help with weight loss?

Orlistat is taken with meals. Orlistat inactivates the gut enzymes needed to absorb fat from food (it is a 'lipase inhibitor'). When taking orlistat 120mg (Xenical), about a third of the fat which is eaten passes straight on through the system and leaves the body in the stools. With orlistat 60mg (alli), a quarter of the fat eaten will pass straight through. Orlistat therefore reduces the calories being absorbed and so can contribute to weight loss.

Orlistat 120mg can also be used in some situations by people with a BMI between 28 and 30, if there are also other risk factors for weight related illness. Discuss with your regular doctor if you think you may benefit from Xenical but your BMI is less than 30.

Orlistat can only help with weight loss if there are other lifestyle changes including to diet and activity levels.

How to lose weight with orlistat

Reducing stored fat

Our bodies are designed to store any excess food and calories as fat. This is obviously a good thing if food supplies are scarce. However in a developed society without major food famine, there is often a tendency to eat more than our bodies actually need and so more and more fat stores are laid down.

The simple answer to losing weight is to limit food and calorie intake to less than the body requires so that the body starts to use up the stored fat. But in reality it is often much more complex and difficult! Orlistat 120mg and 60mg capsules have been medically proven to help with weight loss by reducing the amount of fat which the body absorbs.

There is a huge industry promoting different programmes and diets to assist and encourage people with weight loss. Some are scientifically developed, some involve low calorie replacement meal products, some can seem very extreme! Each person needs to find the method which works best for them, but losing weight will usually involve a commitment to a lifestyle change with new healthy eating patterns and more exercise!

How to take orlistat capsules

The capsules are usually taken 3 times a day, one capsule with breakfast, lunch, and dinner. The capsule can be taken just before the meal, with the meal, or up to an hour after the meal. The capsule should be swallowed whole with water. If a meal is missed or the meal contains no fat, then the capsule should not be taken.

If a meal is known to contain very high amounts of fat then it is best to miss out the dose of orlistat, as there will be significant side effects.

Do not exceed the recommended dose.

How to eat when taking orlistat

Orlistat is only effective if taken alongside a nutritionally balanced, calorie-controlled diet. Just under a third (30%) of the calories should be from fat. Fat can often be 'hidden' within foods and it may be easier to use a fat calculator, initially to work this out. The food, calorie, and fat intake should be spread evenly over three meals. Calorie and fat counters and diet apps may be helpful to set targets and monitor the diet.

A nutritionally balanced diet includes:

  • Five portions of fruit and vegetables per day.
  • High fibre, starchy foods.
  • Low fat milk and dairy.
  • Small to moderate portions of protein - meat, fish, eggs, beans, lentils.


  • Cut down/cut out high fat foods, sugar, and salt.
  • Don't fry meals - grill or steam instead.
  • Cut down alcohol (high in calories).
  • No snacks containing fat between meals - NO biscuits, cakes, savoury snacks, crisps.

This healthy, balanced, and calorie controlled diet will lead to many health benefits as well as weight loss.

See also Diet plans for diabetics which are also really useful for non diabetics, prediabetics, and anyone wanting to lose weight.

Benefits of exercise on weight loss

Orlistat helps to reduce the amount of energy (calories) going into the system, but weight loss will be more effective when combined with an increase in the amount of energy being used. Most energy is used by the body when active, and is burnt off best when exercising. The easiest exercise is the simplest - walk more.

Lots of studies have shown that 20-30 minutes of walking per day makes a big difference to health. You may need to double this in order to really assist in losing weight. As well as exercise, the World Health Organisation (WHO) also recommends limiting the amount of time spent sitting, especially in front of screens.

For further information see NHS - Benefits of exercise.

Effectiveness of orlistat

Orlistat 120mg

Several studies have shown that twice as many patients lose weight when taking orlistat 120mg (Xenical) alongside other weight loss measures. However unless someone loses more than 5% (1/20th) of their starting weight in the first 12 weeks, then research shows that orlistat is unlikely to help overall. If weight loss is continuing, then orlistat can be used indefinitely.

Orlistat 60mg

Orlistat 60mg (alli) has been shown in trials to improve weight loss, with 2-3 times more people losing over 10% of their starting weight in 6 months. However, the research also showed that if there had been no weight loss at 3 months, then orlistat 60mg was unlikely to help.

Beyond 6 months use, the research showed less effective weight loss.

Orlistat 60mg (alli) is manufactured for sale without a prescription, and the manufacturers do not recommend using it for longer than 6 months. However, as with higher strength orlistat 120mg, 60mg can actually be safely used indefinitely. If it is continuing to work for you individually, then Dr Fox doctors can prescribe orlistat 60mg as an 'off label' medication, where doctors take responsibility for the prescribing.

Table showing 5% weight loss

Who should not take orlistat

Orlistat should not be used in the following situations:

  • Allergy to orlistat or other capsule ingredients (see patient leaflet).
  • Malabsorption conditions - unable to fully absorb food from the gut.
  • Cholestasis - a liver and bile duct disorder.
  • Pregnancy.
  • Breastfeeding.
  • Under 18 years old.

Orlistat 120mg (Xenical) and Orlistat 60mg (alli) should not be used together.

Special care with orlistat

  • Kidney stones may develop if you already have kidney disease.
  • Thyroid hormone levels may drop.
  • Fat soluble vitamin levels (vitamins A, D, E, & K and beta-carotene) may fall. If the diet does not contain adequate fruit and vegetables, a multivitamin supplement can be taken at bedtime.
  • After losing large amounts of weight, the dose of many medications may need adjusting. Consult your regular doctor after significant weight loss if you have diabetes, high blood pressure, high cholesterol, epilepsy, or hypothyroidism.

Other medicines with orlistat

Contraceptive pills, including emergency contraception, and also period delay pills, may not be reliably absorbed. Alternative contraceptives should be used.

Blood levels of many other drugs may be affected. If taking any of the following, discuss with your regular doctor before starting Xenical:

  • Anticoagulant drugs especially warfarin.
  • Ciclosporin.
  • Levothyroxine.
  • Amiodarone.
  • Acarbose.
  • HIV medication.
  • Anti-epileptic medication.
  • Diabetic medication.
  • Antidepressants, antipsychotic medication, anti-anxiety medication.

Possible side effects of orlistat

Orlistat is not absorbed, and mostly remains in the gut, so most of the possible side effects are related to the digestive system. As orlistat prevents the absorption of fat, the fat passes straight through the system and may lead to symptoms such as: abdominal discomfort; an urgent need to open the bowels; flatulence (wind) with discharge; oily discharge; oily or fatty stools; or fatty diarrhoea. These side effects often settle with time and with reducing dietary fat intake.

If there is actual bleeding from the bowel, consult your regular doctor.

Headaches and upper respiratory infections are also sometimes reported.

Further information in the manufacturer's patient information leaflet.

Weight monitoring whilst taking orlistat

It is recommended that Orlistat 120mg (Xenical) should be stopped if you have not lost at least 5% of your starting weight after 3 months of treatment.

If weight loss is continuing, Orlistat 120mg can be safely continued indefinitely, but clinical studies have not continued beyond 4 years. If your BMI drops to between 28 and 30, Dr Fox recommends swapping from orlistat 120mg to orlistat 60mg.

The manufacturers recommend that orlistat 60mg (alli) should be stopped after 3 months if there has been no weight loss, at all. Orlistat 60mg can be bought without a prescription, and the license does not recommend use longer than 6 months in total. As with 120mg strength, 60mg can actually be safely used indefinitely, but use of 60mg beyond 6 months is 'off label' where doctors take responsibility for the prescribing. Dr Fox does not prescribe orlistat, if your BMI is below 28.

Other options to assist weight loss

Behaviour modification

As previously mentioned, weight loss and maintenance at the new weight, involves lifestyle change, in particular permanent changes to diet and exercise.

A person's relationship with food is complex. Thinking about this will often help with making sustainable diet changes. There are many small steps which can be taken to support behaviour changes.

Relearning your personal relationship with food can be helped by Cognitive Behaviour Therapy (CBT), mindfulness techniques, or hypnotherapy.

Some people respond well to losing weight alongside others, with clubs and organisations such as Slimming World and Weight Watchers. There are many phone apps, websites, personal trainers, etc. - all aiming to provide more motivation to keep going.

Alternative weight loss medication

Over the years many different medications have been tried to help people to lose weight.

These included appetite suppressants such as sibutramine (Reductil) and different amphetamines. Amphetamines reduce appetite at the brain level but unfortunately, they are highly addictive medications and have many dangerous side effects including rapid heart rate, high blood pressure, and body overheating (hyperthermia). Amphetamines are no longer available for weight loss in the UK, due to their addictive potential and serious safety concerns. A potentially safer, newer amphetamine; phentermine, sometimes also combined with topiramate (Qsymia), is manufactured abroad for weight loss, but it is not available in the UK.

A combination of naltrexone and bupropion (Mysimba) is marketed in the UK as an appetite suppressant. However, due to side effect risks, Mysimba use requires careful monitoring. As an online service, Dr Fox cannot safely provide the level of monitoring needed, and does not supply Mysimba. Mysimba is not available on the NHS.

Liraglutide (Saxenda injection) and semaglutide (Wegovy/Ozempic injection, or Rybelsus tablets) which were originally developed as diabetic medications are also available in the UK to treat overweight and obesity, but usually only under hospital supervision.

Bariatric surgery

Bariatric or weight loss surgery can be used in certain instances to help very obese people to reduce weight. There are a variety of operations but they all involve restructuring of the stomach itself to reduce the volume of food which can be eaten. Bariatric surgery is serious, major surgery and it still needs to be combined with diet and exercise changes for there to be effective weight loss.

Patient Information Leaflet

Illustration of patient leaflet from medicine packet

The Patient Information Leaflet (PIL) is the leaflet included in the pack with a medicine and must be read before taking the medicine. It is written for patients and gives information about taking or using a medicine.

Orlistat FAQs

What if I forget to take a dose of orlistat?

If you forget to take your capsule of orlistat (Xenical, alli) during your meal, it can still be taken up to an hour after your meal has finished. Later than this, just leave the missed capsule out and take one capsule with your next meal, as usual.

Should I swap from orlistat 120mg to 60mg when my BMI drops below 30?

Getting your BMI to below 30 should be celebrated! Dr Fox recommends swapping to orlistat 60mg (alli) once your BMI is below 30, and stopping medication when BMI drops below 28. If using orlistat 60mg (alli) for longer than 6 months, this is 'off label' where doctors take responsibility for prescribing.

What can I do about bad bowel side effects?

Orlistat works by stopping absorption of fat and so the side effects are usually related to fat passing straight through the system. This can cause greasy diarrhoea, oily discharges, stomach cramps, and other symptoms. Taking orlistat does not enable you to eat more fatty foods and get away with it! Unpleasant side effects may settle with time but to help reduce them, it may be necessary to further limit the amount of fat in your diet. It may be that you need to think again about what you are eating - there may actually be much more fat in your diet than you realise.

Further weight loss and orlistat FAQs.

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Dr Amanda Wood

Authored 05 December 2022 by Dr A. Wood
MB ChB Manchester University 1984. NHS GP in Bristol. GMC no. 2855422

Reviewed by Dr C. Pugh, Dr B. Babor
Last reviewed 05 December 2022
Last updated 19 January 2024


Recent Orlistat reviews

Orlistat rated 5/5 in 7 product reviews

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Very good, no workshop.

Sat/12/2023 15:27
Anonymous Verified


Really helpful

Thu/10/2023 17:56
Anonymous Verified


It does work for me

Sun/09/2023 12:35
Anonymous Verified


All good lost over a stone in six weeks

Fri/07/2023 08:10
A. Davidson Verified


This is no magic pill you do have to follow guidelines but works

Sun/06/2023 15:46
Anonymous Verified

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