Dulcolax Dulcolax is the World No.1 laxative brand. It provides predictable overnight relief within 8-12 hours. Yet it is gentle at the same time and does not cause dependency.DirectionsAdult and children over 10 years: 1-2 tab to be swallowed whole. Children 4-10 years: 1 tab to be swallowed wholeAs with all laxatives? Dulcolax should not be taken on a continuous daily basis or for an extended period of time without investigating the cause of constipation.Ingredients1 coated tablet contains 5mg bisacodyl