Betahistine mesylate is primarily used in the treatment of Ménière's disease, a disorder of the inner ear that can lead to dizziness, hearing loss, and tinnitus. It works by improving blood flow in the inner ear, reducing the pressure and alleviating symptoms such as vertigo. Additionally, it is sometimes prescribed to manage vertigo associated with other vestibular disorders. The medication helps restore balance and can significantly improve the quality of life for patients experiencing these conditions. It is typically administered orally and requires consistent use for optimal results.