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.
ANS: C
Macrolides can increase serum levels of other drugs such as warfarin. If these drugs are used with macrolides, serum drug levels should be monitored. All macrolides have this drug interaction. Cardiovascular monitoring is not indicated. The drug may be given as long as serum drug levels are monitored.
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