Generic name:br Orlistatbr Description:br Xenical (Orlistat) is a slimming tablet for those who are obese and who find it hard to lose weight although on a diet. If Xenical is used with a healthy diet and exercise it has shown to help patients lose weight. Xenical works by preventing fat from being digested, which in studies have shown to be very effective for people who, on a normal diet, have difficulties losing weight.