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Information about Dimenhydrinate

Dimenhydrinate is a first generation antihistamine that is used for treatment or prevention of motion sickness or symptoms of nausea and dizziness.


Liver safety of Dimenhydrinate

Dimenhydrinate has not been linked to instances of clinically apparent acute liver injury.

Mechanism of action of Dimenhydrinate

Dimenhydrinate (dye" men hye' dri nate) is the 8-chlorotheophylline salt of diphenhydramine and, thus, combines a first generation antihistamine with a xanthine that is added to counteract the drowsiness caused by diphenhydramine. This combination was approved as an over-the-counter agent in 2004 and is used largely for prevention of motion sickness and nausea.

Dosage and administration for Dimenhydrinate

Dimenhydrinate is available in multiple generic forms as tablets 25 or 50 mg or oral solutions, most of which are available without prescription, a common brand name being Dramamine. A liquid formulation for intramuscular use is also available. The typical adult oral dose is 50 mg taken an hour before expected travel and up to three or four times daily.

Side effects of Dimenhydrinate

Common side effects include sedation, impairment of motor function, confusion, dizziness, blurred vision, dry mouth and throat, palpitations, tachycardia, abdominal distress, constipation and headache. Antihistamines can worsen urinary retention and glaucoma.

First Generation Antihistamines

Second Generation Antihistamines

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