People who are obese should solve the obesity problem by using Weight-loss medicines approved by the Food and Drug Administration (FDA) such as Orlistat (Xenical ® and Alli ®) causes a weight loss between 5 and 10 pounds, although some people lose more weight. Most of the weight loss occurs within the first 6 months of taking the medicine. People taking Xenical need regular checkups with their doctors, especially during the first year of taking the medicine. During checkups, your doctor will check your weight, blood pressure, and pulse and may recommend other tests. He or she also will talk with you about any medicine side effects.