I think I probably have 4 or 5 patients on Topamax. They all are doing well. I started with a low dose, and gradually increased it. Several of them did have some complaints of feeling weird at higher doses, although they reduced their doses, and have done well.
As you said, the side effects (and effectiveness) seem to be dose related. I have been very impressed with the effectiveness - and NONE of my patients have actually needed to stop the medicine.
YES, you can indeed continue the Verapamil, and if it is helping, there is no reason to stop it, you can just add the Topamax. This would probably reduce the dose that would be required with the Topamax.
As always, if you get too many side effects, you could always stop the Topamax
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