Orlistat (also known as tetrahydrolipstatin) is a drug designed to treat obesity. It is marketed as a prescription under the trade name Xenical by Roche in most countries, and is sold over-the-counter as Alli by GlaxoSmithKline in the United Kingdom and the United States. Its primary function is preventing the absorption of fats from the human diet, thereby reducing caloric intake. It is intended for use in conjunction with a healthcare provider-supervised reduced-calorie diet.
Contributions by Fvasconcellos, Edgar181, and Bk0.