Orlistat (brand names Alli, Xenical) is a weight-loss medication that works by blocking about a quarter to a third of dietary fat from being absorbed by the body, acting as a lipase inhibitor in the stomach and intestines, and is used alongside a low-calorie diet and exercise for weight management in overweight or obese individuals. This unabsorbed fat is then passed out in the stool, reducing overall calorie intake and aiding weight loss or maintenance.

Orlistat (brand names Alli, Xenical) is a weight-loss medication that works by blocking about a quarter to a third of dietary fat from being absorbed by the body, acting as a lipase inhibitor in the stomach and intestines, and is used alongside a low-calorie diet and exercise for weight management in overweight or obese individuals. This unabsorbed fat is then passed out in the stool, reducing overall calorie intake and aiding weight loss or maintenance.