Commonly used weight loss drugs include appetite suppressants, drugs that increase energy metabolism, and drugs that inhibit intestinal digestion and absorption. Common adverse reactions include central nervous system excitation, which manifests as irritability, insomnia, abnormal thinking, limb spasms, elevated blood pressure, abnormal electrocardiogram, agitation, and dizziness. Gastrointestinal adverse reactions include dry mouth, nausea, vomiting, abdominal pain, diarrhea, abdominal distension, increased intestinal exhaustion, fatty diarrhea, and increased incidence of gastrointestinal reactions if the fat content of food is high, etc. Long-term use may lead to addiction. Rare side effects include respiratory infections, dyspnea, influenza, anxiety, menstrual disorders, urinary tract infections, etc. Rarer side effects include elevated alkaline phosphatase, elevated transaminases, severe hepatitis liver failure, and allergic reactions clinically manifested as pruritus, rash, urticaria, angioneurotic edema, abnormal coagulation, and skin petechiae.