Appetite control drugs can be mainly categorized into fenfluramine, naltrexone, and lorcaserin. 1. Fenfluramine: it can reduce appetite by acting on β-receptors to increase oxygen consumption and promote energy release. Adverse effects include increased frequency of non-diarrheal stools, mild abdominal pain, dizziness, fatigue, dry mouth, etc. It is not recommended for patients with mental depression, epilepsy and pregnant women. With mental depression, epilepsy patients and pregnant women are prohibited. 2. Naltrexone: it can act on the center to suppress appetite, adverse reactions mainly include sleep difficulties, anxiety, agitation, abdominal pain or cramps, nausea or vomiting, joint muscle pain, headache. Allergic to this drug and acute hepatitis or liver dysfunction is prohibited. 3. Cloxacillin: through selective agitation of the hypothalamic satiety center, reduce the amount of food intake and enhance the feeling of satiety, adverse reactions mainly include headache, dizziness, fatigue, nausea, dry mouth and constipation. It is contraindicated in women during pregnancy. Appetite control drugs are generally used in the treatment of bulimia and obesity, the general weight loss population try not to use, because of its more side effects, more significant, need to be used with caution. The above drugs need to be used under the guidance of a doctor, do not buy them on your own to avoid serious consequences.