A Patient Is to Begin Taking Phenytoin [Dilantin] for Seizures

A patient is to begin taking phenytoin [Dilantin] for seizures. The patient tells the nurse that she is taking oral contraceptives. What will the nurse tell the patient?

A) She may need to increase her dose of phenytoin while taking oral contraceptives.
B) She should consider a different form of birth control while taking phenytoin.
C) She should remain on oral contraceptives, because phenytoin causes birth defects.
D) She should stop taking oral contraceptives, because they reduce the effectiveness of phenytoin.