What is bisacodyl? Bisacodyl is a stimulant laxative. It causes muscles in the colon to contract and stools to pass. Bisacodyl is used to treat constipation and to cause evacuation of the colon. What is the most important information I should know about bisacodyl? Do not use bisacodyl if you have stomach (abdominal) pain, nausea, or vomiting. Rectal bleeding . if you are pregnant. if you are breast-feeding a baby N.B Bisacodyl products should not be used for longer than one week How should I take bisacodyl? Take each dose with a full glass of water. Do not take bisacodyl tablets within 1 hour after taking an antacid or drinking milk. Bisacodyl is also available as a rectal suppository.