NCIt definition : The hydrochloride salt form of betahistine, a histamine analog with weak histamine
H1 agonistic and more potent histamine H3 antagonistic properties. Upon intranasal
administration, betahistine binds to histamine H1 and H3 receptors and exerts its
agonistic and antagonistic actions locally and centrally. This promotes cochlear,
vestibular and cerebral blood flow, decreases neuronal firing in the vestibular nuclei
and increases histamine synthesis and release in the brain which facilitates vestibular
compensation. Increased blood flow around the inner ear reduces the amount of fluid
in the inner ear and may alleviate vertigo, tinnitus, and hearing loss.;