Meridia 15mg is used in combination with a reduced calorie diet and exercise to help people who are overweight lose weight and maintain their weight loss. Active ingredient is sibutramine. Sibutramin is in a class of medications called appetite suppressants. It works by acting on appetite control centers in the brain to decrease appetite. Meridia 15mg is an orally administered agent for the treatment of obesity. Chemically, the active ingredient is a racemic mixture of the (+) and (-) enantiomers of cyclobutanemethanamine, 1-(4-chlorophenyl)-N,N-dimethyl-a -(2-methylpropyl)-, hydrochloride, monohydrate, and has an empirical formula of C17H29Cl2NO. Its molecular weight is 334.33.c