<prompt> Drug not used for Pseudomembranous colitisMetronidazoleVancomycinFidaxomycinStreptogramins  <response>: All except streptogramins are used. Drug of choice for pseudomembranous colitis is metronidazole,in resistant cases vancomycin given orally. Fidaxomycin is newer class of macrolide type of antibiotic used specially for PMC Ref:KDT 6e p799 