Primidone
"After taking a half of a tiny pill of Primidone for 4 nights at bedtime I could not walk down the hall when I woke up. I was falling every where &  was so nauseated & I had horrible Nightmares that woke me up screaming ! First thing Monday morning I called the neurologist that had prescribed it  & the receptionist would not let me talk to her- Said she would call be back . she did not call so I called again later in the Day . Still would not let me talk to the Doctor  ,but told me"  she said never take it again ."My primary Care Dr sent me to see a specialist who checked my eyes & hearing & a lot of things with his special machines .He determined that it was the Primidone that was causing the problems. ( Of course I never took it again ) Bt"