After taking medicine allergy, drinking more water also has a certain role, because drinking more water can promote the metabolism and excretion of drugs, is conducive to allergy symptoms relief. However, if you are allergic to medication, you need to actively carry out anti-allergy treatment, and stop taking the original medication. Patients with drug allergies may form a drug rash, drug rash once formed, mainly for hormone therapy, oral prednisone or dexamethasone and other drugs for anti-inflammatory, drug allergy after the formation of the inflammatory reaction is more obvious, if the local skin damage accompanied by a certain degree of itching, you can apply antipruritic ointment, such as topical application of hydrocortisone butyrate cream and so on.