Betahistine mesylate is 2-[2-(methylamino)ethyl] pyridine dimethanesulfonate. Molecular Formula: C10H20N2O6S2. Molecular Weight: 328.4.
Betahistine mesylate occurs as an odorless, hygroscopic white crystal or crystalline powder with a slightly bitter taste. It is very soluble in water and methanol, soluble in ethanol and practically insoluble in acetone, ether and chloroform.