I take trileptol and topomax for epilepsy. Are there vitamin supplements I should take w these meds? I don't know what issues they cause.

NO. With anticonvulsants calcium supplements are sometimes prescribed . Vitamins are not necessary or beneficial.
Calcium, folic acid. Generally, one should take calcium and vitamin d, and folic acid, when on anti-seizure medications. Trileptal can cause low sodium, and topamax (topiramate) can cause kidney stones; it is important to drink plenty of fluids, and add some salt, when exercising in the heat.