Xenical is a drug used for the treatment of obesity including weight loss and weight maintenance when used with a reduced-calorie diet. It blocks the absorption of fat, thereby reducing caloric intake.
Orlistat is used for managing obesity in overweight adults. Combined with a reduced-calorie and low-fat diet, it is also used to reduce the risk of weight regain after previous weight loss. Its primary function is preventing the absorption of fats from food.