Final answer:
The nurse should inform the woman that her current medications will reduce the effectiveness of the oral contraceptive pill.
Step-by-step explanation:
The nurse's most appropriate response would be B. 'Your current medications will reduce the effectiveness of the oral contraceptive pill.'
Barbiturates can lead to increased metabolism of hormones in the liver, which can decrease the effectiveness of the oral contraceptive pill. Phenytoin sodium, another antiepileptic medication, also has the potential to interact with oral contraceptives, reducing their effectiveness.
Therefore, it is important for the woman to explore alternative contraceptive options and consult with her healthcare provider to find the most suitable method.