Depending on the type of drug, overdose can cause different clinical symptoms. Patients with diarrhea who take more antidiarrheal drugs will inhibit gastrointestinal motility and cause constipation. Patients who have been sleeping poorly for a long time, if they take too many sleeping pills, it will cause drowsiness and call for sleep, causing the nervous system to be significantly inhibited. Patients with recurrent high fever after a cold, if they take too many antipyretics at once, it will cause massive sweating and hypothermia. Patients with allergic rhinitis take more anti-allergic drugs at one time, because the drugs are mainly metabolized by the liver, which can cause liver insufficiency and liver failure in severe cases.