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Antihistamines treat nausea and vomiting by:

a. Blocking serotonin from binding with and stimulating 5-HT3 receptors.
b. Functioning as muscarinic receptor antagonists.
c. Inhibiting the actions of acetylcholine at the postganglionic parasympathetic neuroeffector sites.
d. Competitive inhibition or by blocking H1 receptor sites.

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d.Competitive inhibition or by blocking H1 receptor sites.

  • #2
Thanks for the Q & A. I was looking for it.