I don't know the answer, but Levsin gave me some horrible side effects (mainly nausea & vomiting) so I wouldn't be surprised if it could cause vertigo as well. I have apparently experienced olfactory hallucinations from Bentyl - about an hour after taking it, suddenly everything smelled like body odor. Literally everything - my food, my pumpkin scented hand lotion, my whole body, my desk at work, etc. That stinky sensation went away after a couple hours and I hadn't taken anything else, so I presume it was a weird side effect of the Bentyl. Side effects can be really disconcerting sometimes! And I've experienced vertigo myself (I had labyrinthitis last year so I spent about 3 months with the world spinning like that) so I know how awful and scary that can be. It's probably best to ask your doctor about it and see if there's something else they can prescribe you.