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Medication

There are two drugs available on prescription for people who are obese (usually with a BMI of 30 and over) and they work by helping you to eat differently. You have to lose 2.5 kg / 5lbs of weight on your own, before they can be prescribed. The guidelines say they can only be prescribed for up to a year. Like simple diets, they will not keep the weight off after you stop taking them, unless you make long-term changes in your behaviour.

Xenical (Orlistat)
Xenical stops your body from absorbing fat. You have to follow a low-fat diet or it has unpleasant side effects, including diarrhoea and nausea. It therefore works mainly by forcing you to eat a low fat diet.

Reductil (Sibutramine)
Reductil makes you feel full more quickly and thereby satisfied with a smaller meal. It can help you lose weight, but you will have to eat sensibly while taking it and afterwards or you will put the weight back on again.

New developments
You may have read in the papers about the 'fat jab' and about a new drug that may help people lose weight without changing their diet. Both of these stories relate to early stages of research. Clinical trials are necessary if either of these treatments are to become available and as yet trials are not underway.

If clinical trials do go ahead, and if they are successful, these treatments will still not be available for prescription for a number of years.

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