answer:Betahistine seems to suppress the stimulation that the inner ear sends to the brain, so that a dysfunctional inner ear won’t be able to send as many faulty messages to the brain. This is only effective if it is truly an inner ear disorder causing your symptoms. If you are taking it as directd and not noticing improvement, than you need further evaluation. Cetirizine is known as Zyrtec here in the US, and it is an antihistamine for skin and nasal allergies. Perhaps the person prescribing it suspects allergies as a contributing factor. Evaluating vertigo is sometimes a process of elimination. There are so many potential contributors that it is rarely one clear cause. If you don“t already have a follow-up visit scheduled, call to set one up soon.