Belviq (lorcaserin) is a prescription drug used to treat obesity. It works by affecting chemicals in your brain to decrease appetite. Belviq is part of a full weight-loss program which also includes healthy diet and exercise. This medicine can be taken to treat obesity that is related to other conditions such as diabetes, high blood pressure, and high cholesterol. However, Belviq cannot treat these other underlying conditions that are related to obesity. Belviq is an FDA- approved weight-loss medicine. Overweight patients can lose weight and keep the weight off as part of this full weight-loss program. A healthy weight can reduce your risk of other weight-related conditions such as obesity, hypertension, high cholesterol, stroke, and heart attack. Chronic weight management in certain patients. It is used along with a reduced-calorie diet and increased physical activity. Belviq is a serotonin 2C receptor agonist. The exact way Belviq works is not known. It is thought to work in the brain to promote a full feeling and decrease hunger.