Obesity is a prevalent disease that has reached epidemic proportions in both the developed and developing world. In the United States, it is estimated that 66% of the adult population is overweight or obese. There are several available pharmacologic treatments for obesity used as an adjunct to diet, exercise, and behavioral therapy. However, weight loss with these agents is modest and usually reversible when the drug is discontinued, and novel, more-effective anti-obesity agents are desperately needed.