Many nonprescription products for weight loss are available at drugstores and supermarkets and over the Internet. Many of these have never been proven effective, and those that are effective often come with warnings. For example, many diet pills promote water loss from the body and may lead to dehydration or loss of essential minerals.
Nonprescription appetite suppressants often work by making you less hungry.
Some people use water-loss pills (diuretics, such as Aqua-Ban) to lose weight. However, these pills only get rid of water and do not reduce the amount of fat in your body. Using water-loss pills this way is not recommended and can be dangerous.
The U.S. Food and Drug Administration (FDA) has banned the sale of ephedra because of concerns about safety. The product has been linked to heart attacks, strokes, and some deaths.
Ephedra and ephedrine-the active ingredient in ephedra-decrease appetite by increasing metabolic rate.
WebMD Medical Reference from Healthwise