Betahistine was again reviewed by the FDA in June of 1999 (click here for details).
Explanations commonly given are that the drug is a vasodilator, or that it acts on subreceptors of histamine.
H1 and H2 are post-synaptic receptors and H3 is a pre-synaptic receptor.
Betahistine can be ordered at the very lowest prices from large compounding pharmacies.
As of 2018, the "out of pocket" cost in the US is typically about /month.