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Orlistat works by blocking chemicals enzymes in your gut which digest fat. Nearly a third of the fat that you eat is blocked by orlistat. The undigested fat is not absorbed into your body and is passed out with your stools faeces.

The normal dose is one capsule - mg, three times a day with each meal. However, you do not need to take one if there is no fat in the meal or if you miss a meal. Liraglutide is a new medicine that was licensed for the treatment of obesity in January There has been limited experience of this treatment, which is only available in injectable form. It is currently mainly being used in specialist centres for people whose obesity has led them to develop other illnesses such as diabetes.

Two other medicines - sibutramine and rimonabant - previously used to help with weight loss are no longer available in the UK because of concerns over their safety. Orlistat for weight loss is available via a private service from your local pharmacist. Book a consultation to discuss your weight loss options through the Patient Access app. Reported side-effects of eating too much fat include: flatulence, oily spotting on underwear, increased urgency and loose bowel movements.

Studies have shown that, on average, orlistat, plus a weight-reducing diet and exercise, causes more weight loss than a weight-reducing diet and exercise alone.

In others, it is less effective. One reason why orlistat may not work is that you may think that you can relax your weight-reducing diet, and the orlistat will 'do it all'. This is not true. In order to lose weight you still have to eat less and exercise regularly. Remember, orlistat prevents only some of the fat that you eat from being absorbed just under a third.

But, if you do not keep to a healthy weight-reducing diet, and you eat more fat chocolates, cakes, etc , the extra fat that you eat will easily cancel out the effect of the orlistat.

Orlistat is not used in everyone who wants to lose weight. It is only recommended in people over a certain body mass index BMI. For a doctor to prescribe orlistat, they also need to be sure that you have tried changing your diet and increasing your physical activity levels first.

However, most doctors will review treatment regularly and will decide if it is still appropriate for you to carry on taking orlistat. If you continue to lose weight after six months, your doctor may advise that you continue to take orlistat. This may be for up to years, or longer if you have a great deal of weight to lose. After treatment is stopped, a number of people who have lost weight with the help of orlistat put weight back on. I have been takin these again for month now and lost 11lb so far If you have a lot of fat in you diet i.

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Alli weight-loss pill: Does it work? By Mayo Clinic Staff. Thank you for Subscribing Our Housecall e-newsletter will keep you up-to-date on the latest health information. Please try again. Something went wrong on our side, please try again. Show references Frequently asked questions Alli. Accessed Sept. If you are having an operation or dental treatment, tell the person carrying out the treatment which medicines you are taking. This medicine is for you. Never give it to other people even if their condition appears to be the same as yours.

Do not keep out-of-date or unwanted medicines. Take them to your local pharmacy which will dispose of them for you. Dated May Updated November Hi I have my first 2 appointments tomorrow obesity clinic and general surgery. Hoping for gastric bypass. How long have people waited from this appointment to surgery.

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