Before the therapy,take dexamethasone 0 mg orally,im diphenhy dramine 0 mg,iv cimetidine 00 mg,or iv ranitidine 0 mg.治疗前口服地塞米松0mg,给予苯海拉明肌肉注射0mg,静脉注射西咪替丁 00mg或雷尼替丁0mg。