Xenical is used for:br Managing obesity in adults and adolescents 12 years and older. It is also used to reduce the risk of weight regain after previous weight loss.Xenical is a gastrointestinal lipase inhibitor. It works by inhibiting the digestion of fats from the diet and should be used with a reduced-calorie diet.br br How to use Xenical:br Use Xenical as directed by your doctor. Check the label on the medicine for exact dosing instructions.br br * An extra patient leaflet is available with Xenical . Talk to your pharmacist if you have questions about this information.br * Take Xenical by mouth with or up to 1 hour after each main meal that contains fat br * If a meal is missed or contains no fat, do not take a dose of Xenical.br * You should take a multivitamin supplement containing vitamins A, D, E, and K to ensure good nutrition. The supplement should be taken at least 2 hours before or after you take Xenical , such as at bedtime.