The medicine contains Orlistat as the active ingredient that works by inhibiting the enzyme pancreatic lipase. This enzyme is responsible for the conversion of the triglycerides into the fatty acids. It stops the production of the enzyme pancreatic lipase in the body. As a result, triglycerides are not converted into the fatty acids. Thus, these undigested triglycerides are of no use to the body and are thrown out of the body.
It does not affect the appetite of the individual so there is no effect on the urge of eating. In simple words, generic Orlistat do not allow the consumed food to get converted into proteins, carbohydrates, and fats. Hence, generic Xenical promotes the weight loss.