Any time a doctor suggests a new prescription, be sure to talk about what other medicines, supplements, herbs, and vitamins are already being taken. Sometimes one kind of medicine changes the way another kind of medicine works in the body. If two kinds of medicine affect each other, the doctor may prescribe something else or change the amount to be taken.

Banzel increases blood phenytoin (Dilantin) concentrations by about 20%. Valproate (Depakote, Depakene) can increase blood concentrations of Banzel up to 70%. Banzel can lower levels of birth control hormones and make birth control pills less effective, especially if they are low-dose birth control pills. Most possible drug interactions with Banzel have not yet been studied.