The active ingredient orlistat is used for the treatment of obesity, along with a moderately hypocaloric diet. It is an anti-obesity medication, although it does not take away the appetite. It is a potent, specific and long-acting gastrointestinal lipase inhibitor. The inactivated enzyme is unable to hydrolyze dietary fats, allowing 30% of fat ingested with food to pass through the gastrointestinal tract without being digested. Therefore, your body can not convert this dietary fat into energy source and convert it into adipose tissue. Therefore, this will help you reduce your weight.