Xenical is the brand name for orlistat, a medication used to aid weight loss and manage obesity. Developed by Roche, Xenical works by inhibiting the absorption of dietary fats in the intestines, which helps reduce calorie intake. Approved by the FDA, it is typically used in conjunction with a reduced-calorie diet and exercise program. Xenical is prescribed for individuals with a BMI of 30 or higher, or a BMI of 27 or higher with weight-related health conditions. Common side effects include gastrointestinal issues such as oily stools and flatulence.