Betahistine, sold under the trade name Serc among others, is a medication used to treat vertigo episodes in adults suffering from Meniere's disease. As the name suggests, betahistine acts on H1 histamine receptors as an agonist, vasodilating inner ear blood vessels thus diminishing endolymphatic pressure. It also acts on H3 histamine receptors as an antagonist. Betahistine is available in 8mg 16mg and 24mg tablets.
The correct answer is B.
References:
https://go.drugbank.com/drugs/DB06698
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