Drug allergies that cause itching need to be determined first if it is indeed a drug allergy. If it is determined which type of medication is allergic, the medication needs to be stopped promptly. Then take oral anti-allergy medication, for example, you can take oral Epastine or Loratadine, etc. If the itching is obvious or the allergic site is obvious, oral or intravenous glucocorticoids, such as oral prednisone or dexamethasone, are also needed. If intravenous drip is used, intravenous prednisolone or hydrocortisone, and dexamethasone can be chosen. Of course topical glucocorticoids are also needed, usually topical dinaide cream or mometasone furoate cream, etc.