Betahistine dihydrochloride is a histamine analogue used primarily in the treatment of Ménière's disease, a disorder of the inner ear that can lead to vertigo, hearing loss, and tinnitus. It acts as a vasodilator to improve blood flow in the inner ear, reducing the severity and frequency of vertigo attacks. It also helps alleviate associated symptoms such as nausea and vomiting. The compound is sometimes prescribed for other vestibular disorders or vertigo-related conditions. As a pharmaceutical active ingredient, it is typically formulated into oral tablets for long-term management of chronic inner ear issues under medical supervision.