Please Clarify The Combination Of Carbamazine (Carbatrol) With St. John's

Please clarify the combination of carbamazine (Carbatrol) with St. John's Wort. I have read that the St. John's Wort has an adverse effect on carbamazine by effecting its seratonin level, thereby contributing to the probability of seizures. How close is this to being correct? Thank you.