A 60-year-old man was diagnosed as pseudomembranous colitis with chief complaint of fever and abdominal distension after a cerebral operation. It was ineffective although vancomycin hydrochloride (VCM) was given orally. Complications occurred. The patient had toxic megacolon and paralytic ileus. VCM was administrated via an ileus tube. In addition, the bowel was lavaged and VCM was sprayed by colonoscopy. This therapy was very effective. Generally, a patient with pseudomembranous colitis concomitant with toxic megacolon or/and paralytic ileus is considered to have a poor prognosis, however, he completely recovered by a combination of medical treatment.