Orlistat (also known as tetrahydrolipstatin) is a drug designed to treat obesity. It is marketed as a prescription drug under the trade name by Roche in most countries, and is sold over-the-counter as by GlaxoSmithKline in the United Kingdom and the United States. Its primary function is preventing the absorption of fats from the human diet by acting as a lipase inhibitor, thereby reducing caloric intake. It is intended for use in conjunction with a healthcare provider-supervised reduced-calorie diet.
The effectiveness of orlistat in promoting weight loss is definite, though modest. Pooled data from clinical trials suggest that people given orlistat in addition to lifestyle modifications, such as diet and exercise, lose about 2-3 kilograms (4.4-6.6 lb) more than those not taking the drug over the course of a year.Orlistat also modestly reduces blood pressure, and appears to prevent the onset of type 2 diabetes, whether due to weight loss itself or to other effects; in a large randomized controlled trial, orlistat was found to reduce the incidence of diabetes by nearly 40% in obese people.
|Description||White or almost crystalline powder||White crystalline powder|
|Specific rotation||-33 -35°||-34°|
|Loss on drying||<0.5%||0.35%|
|Assay(HPLC)||>=96.0%(ON DRY BASIS)||97.4%|