Find patient medical information for Bisacodyl ( Dulcolax , Fleet, and others) on WebMD including its uses, side effects and safety, interactions, pictures, warnings, and user ratings By acting directly in the rectum, Dulcolax® Suppositories work by stimulating your natural bowel movement and softening stools for fast & effective relief from occasional constipation in as little as 15 to 60 minutes. Easy-to-read patient leaflet for Bisacodyl Suppositories . Includes indications, proper use, special instructions, precautions, and possible side effects.