A nurse is caring for a client who is taking combination oral contraceptive ethinyl estradiol and drospirenone and is about to begin taking rifampin to treat tuberculosis. Which of the following instructions should the nurse give the client due to a possible drug interaction?
"Increase the rifampin dose."
"Increase the oral contraceptive dose."
"Wait 2 hours between taking each drug."
"Use additional birth control methods."