Patients with drug allergies with mild symptoms can recover on their own after 3-5 days of discontinuing the allergenic drug. Patients with severe drug allergies usually do not heal on their own and require aggressive anti-allergy treatment. Drug allergy is caused by the drug itself or by ingredients added during the drug making process and is more common in clinical practice. Mild drug allergies often manifest as skin symptoms, such as abnormal sensation, itching, red patches, papules, and a variety of rashes, such as a rash, and the allergic symptoms can generally resolve themselves after 3-5 days of discontinuing the drug. Severe allergic reactions to drugs can induce patients to suffer from respiratory distress, chest tightness, palpitations, pallor, drop in blood pressure, and even life-threatening symptoms such as laryngeal edema and asphyxia, and patients should promptly visit the emergency department for relevant symptomatic supportive treatment. Patients with drug allergy should reduce the consumption of spicy and stimulating foods during treatment, try to avoid peanuts, nuts and other foods with high allergenicity, and need to ensure sufficient sleep and regular rest.