Belviq is a medicine used in the treatment of obesity, specifically to help overweight patients lose weight. The active ingredient of the medicine, lorcaserin, works by enhancing the effect of serotonin receptors in the brain - resulting in feelings of fullness and appetite satisfaction. It is used alongside a healthy diet and exercise plan in the treatment of obesity.Belviq (lorcaserin) is a drug used in weight loss programs. The drug is mostly used to treat obesity related to high blood pressure, diabetes, or high cholesterol. Belviq works by blocking some of the fat and keeping it from being absorbed by your body. Belviq aids the weight loss and at the same decreases the risk of regaining the weight again. It is worth noting that Belviq will not treat other conditions such as diabetes and thus you have to continue taking their medication. However, this weight loss drug is not recommended for pregnant mothers and those below 18 years of age. Belviq is supplied in the form of capsules and should be administered by the oral route with or without food.