This is Dr. David
if he has c diff infection in his stools he needs to be started on flagyl or metronidazole to start to kill his c diff infection
another option is vancomycin to help kill off the clostridium difficile infection.
he should be adding probiotics and yogurt into his diet to help add good bacteria into his GI system.
if he is in the hospital, they should be treating him with oral metronidazole pills or oral vancomycin pills
and they should be giving him probiotics as well.
let me know if you have questions.