The time taken for drug allergy symptoms to disappear cannot be generalized and is mainly related to the severity of the allergy. The most common symptoms are a rash or papular rash with itching, dizziness, headache, nausea, vomiting, abdominal pain, diarrhea and other symptoms. In mild drug allergy, the symptoms will subside slowly within 1 week after the patient is removed from the allergic drug. For moderate drug allergy patients, antihistamines are usually needed after the allergic drug is removed, and the symptoms will gradually subside within 1-2 weeks. In the case of severe drug allergy, patients need symptomatic support treatment with glucocorticoids or even immunosuppressants and gammaglobulin, and it takes more than 2 weeks for the symptoms to disappear. Patients who develop drug allergy need to record what kind of drug caused the allergy and clearly inform the doctor before visiting the doctor again or taking the drug to prevent taking the same kind of drug or drugs with similar structure that cause allergy again.