I have never been on a cruise and have been afraid to as I have had positional vertigo?

Antivert may or maynot help with your vertigo but a common side effect is drowsiness, then you would be sleeping during most of the cruise. I also suffer from benign positional vertigo and have taken antivert, but the key is to find out what is causing the vertigo. The doctors usually find out the problem is with the inner ear. There may be fluid in your ear or the "calcium particles" in the ear canal may be clumped together (that was my problem). Before you make arrangements to go on a cruise, make an appointment with your doctor or an ear specialist (ENT), and find out what the cause is. It may be something as simple as what I described and the treatment is a simple exercise that will redistribute the particles in your ear canal. The procedure is called the Epley Manuever and it really helps. Your doctor can perform this procedure in his/her office and then when you feel a vertigo attack coming on you can do the manuever yourself.

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I only wish someone would have told me about this along time ago, it would have saved me several trips to the ER. Best of of luck to you and enjoy your cruise.