Mr Benton is a 65 year old male who you are meeting for the first time. He is requesting medication to prevent episodes of vertigo. You review his notes and see that he was recently diagnosed with Meniere’s disease at an ENT appointment. He reports good symptom control with Cinnarizine but finds it difficult to predict when episodes occur and isn’t always able to access the medication. His symptoms have not progressed, (episodes of vertigo, tinnitus and hearing loss lasting approximately six hours). Mr Benton is otherwise fit and well, he works part time in a jewellery store and does not smoke or drink alcohol.
Which of the following medications would be most appropriate in preventing episodes?