The Nurse Is Preparing to Administer Clarithromycin to a Patient

The nurse is preparing to administer clarithromycin to a patient. When performing a medication history, the nurse learns that the patient takes warfarin to treat atrial fibrillation. The nurse will perform which action?

A) Ask the provider if azithromycin may be used instead of clarithromycin.
B) Obtain an order for continuous cardiovascular monitoring.
C) Request an order for periodic serum warfarin levels.
D) Withhold the clarithromycin and notify the provider.