Meridia, ingredient is sibutramine, is available in 15 mg dosages in our Online Pharmacy. If your doctor has determined you are obese or over-weight- what you need is Meridia , a medicine that helps you weight reduced. Exercise for three months didn't help you lose enough weight your doctor may start you on Meridia. This medicine makes you feel full sooner so you eat less food. By eating less you should be able to lose and control your weight.