临床药用(－)- ephedrine的结构是

The drug that has more selective for vascular spasmolysis is ( ). A: homatropine B: scopolamine C: ephedrine D: anisodamine E: physostigmine

A 7-year-old boy with a previous history of bee sting allergy is brought to the emergency department after being stung by 3 bees. If this child has signs of anaphylaxis, what is the treatment of choice?() A: Diphenhydramine<br/>(an antihistamine agent) B: Ephedrine C: Epinephrine D: Methylprednisolone<br/>(a corticosteroid) E: Phenylephrine