A Male Client of African Descent Was Prescribed Erythromycin, a Sulfonamide

A male client of African descent was prescribed erythromycin, a sulfonamide, to treat his bacterial infection. The client comes to the emergency department. What will be a priority assessment of the nurse?

A) Assess the client's renal function tests.
B) Assess the client's urinary output.
C) Assess the client's level of red blood cells (RBCs) .
D) Assess the client's liver function tests.