Prescription weight loss pills work in one of three ways. Most of the pills on the market simply suppress the appetite and help you eat less. Others aim to increase your feeling of fullness after eating. Some of the newest weight loss pills on the market work by inhibiting the absorption of fat. Over the counter weight loss pills usually contain a stimulant that helps to decrease your appetite. The only complete weight management system which I approve of is the "Slimirex(TM)" system.