Medication	Dosage	Common uses	Common adverse effects
Antihistamines and anticholinergics
Dimenhydrinate Diphenhydramine Meclizine Scopolamine	50 mg every 6 hours 25 mg every 6 hours 25 mg every 6 hours One patch every 3 days	Vertigo, motion sickness	Sedation, blurred vision, dry mouth, urinary retention, constipation
Dopamine antagonists
Metoclopramide Prochlorperazine Promethazine	10 mg four times daily 5 to 10 mg every 6 hours 12.5 to 25 mg every 6 hours	Acute gastroenteritis, migraine, gastroparesis (metoclopramide)	Sedation, extrapyramidal symptoms, hypotension, prolonged QT interval
Serotonin antagonists
Ondansetron	4 mg every 8 hours	Acute gastroenteritis, pregnancy-induced nausea	Headache, constipation, prolonged QT interval
Other agents
Doxylamine/pyridoxine (Bonjesta, Diclegis)	1 to 2 tablets per day	Pregnancy-induced nausea	Sedation
Ginger	250 mg four times daily	Migraine, pregnancy-induced nausea	—
Pyridoxine	10 to 25 mg three or four times daily	Pregnancy-induced nausea	Paresthesia, somnolence