What patient teaching should be included with prescribing phenytoin and oral contraceptives?
a. Phenytoin can increase the effectiveness of oral contraceptives and result in hormonal imbalances.
b. Phenytoin can decrease the effectiveness of oral contraceptives.
c. Phenytoin is contraindicated in patients taking oral contraceptives.
d. Mixing phenytoin and oral contraceptives could result in the inability of becoming pregnant.