BISACODYL ACTS DIRECTLY ON THE COLONIC MUCOSA TO PRODUCE NORMAL PERISTALSIS THROUGHOUT THE LARGE INTESTINE. IT IS A CONTACT STIMULANT LAXATIVE. ON CONTACT WITH THE MUCOSA OR SUBMUCOSAL PLEXI OF THE LARGE INTESTINE, BISACODYL STIMULATES SENSORY NERVE ENDINGS TO PRODUCE PARASYMPATHETIC REFLEXES RESULTING IN INCREASED PERISTALTIC CONTRACTIONS OF THE COLON. IT HAS ALSO BEEN SHOWN TO PROMOTE FLUID AND ION ACCUMULATION IN THE COLON, WHICH INCREASES THE LAXATIVE EFFECT.