ANSWERS: 1
  • I think it's easiest to understand why a drug works when you understand the actions of the receptor it targets. If it's an agonist, it'll have the same actions as the normal receptor response, while the antagonist blocks those actions (you probably already know that, but I like to be thorough). Diphenhydramine is a histamine receptor antagonist (antihistamine), so I searched wikipedia for the histamine receptor and found this: http://en.wikipedia.org/wiki/Histamine_H1_receptor Hope it's helpful.

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