Pseudomembranous colitis is inflammation of the colon that occurs in some people who have taken antibiotics. Pseudomembranous colitis is sometimes called antibiotic-associated colitis or C. difficile colitis. The inflammation in pseudomembranous colitis is almost always associated with an overgrowth of the bacterium Clostridium difficile.
Severe pseudomembranous colitis can be life-threatening. However, treatment is usually successful.