Why Must Vancomycin Be Administered Intravenously Except When Used to Treat

Multiple Choice

Why must vancomycin be administered intravenously except when used to treat intestinal infections?

A) Vancomycin is poorly absorbed from the intestinal tract.
B) Vancomycin is toxic but less so if injected intravenously.
C) Injected vancomycin is easier to target to the site of infection.
D) Vancomycin is effective against only Gram-positive bacteria.
E) Vancomycin has a high therapeutic index.