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Understanding Anesthesiology - The Global Regional Anesthesia ...

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Diphenhydramine<br />

Class<br />

Antihistamine, antiemetic. Used in the treatment of pruritis, allergic reactions and druginduced<br />

extrapyramidal reactions.<br />

Mechanism of Action<br />

Diphenhydramine is a competitive inhibitor at the histamine H1 receptor. <strong>The</strong> antiemetic effects<br />

is related to central anticholinergic effect as well as histamine antagonism in the vestibular<br />

system in the brain.<br />

Dose<br />

Adults: 25-50 mg PO q6-8 hours; 10-50 mg IV/IM q 6 hours; maximum daily dose 400 mg.<br />

Onset<br />

IV: 5 minutes<br />

PO:

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