A 24-year-old woman comes to the GP for a routine health maintenance examination. She says she will be going on a whale watch for her friend’s wedding next weekend but is worried because she has history of motion sickness. The physician prescribes diphenhydramine. Which of the following mechanisms of action is responsible for this agent’s effectiveness in this patient?
Agonism; α1
Agonism; β3
Agonism GABAB
Antagonism; α2
Antagonism; H2
Antagonism; M3
