Which laboratory blood test result for a patient taking clarithromycin (Biaxin) and warfarin (Coumadin) should you report immediately to the prescriber?
a. Potassium 3.6 mEq/L
b. Sodium 134 mEq/L
c. Blood urea nitrogen (BUN) 21 mg/dL
d. International normalized ratio (INR) 4.6
Question 2
For which patient with a bacterial infection do you question a prescription for tetracycline (Tetracon)?
a. 35-year-old patient with AIDS
b. 16-year-old patient with severe acne
c. 65-year-old patient with hypertension
d. 25-year-old patient taking oral contraceptives