Ease into constipation relief with Dulcolax® Stool Softener. Dulcolax® Stool Softener is a stimulant-free laxative made to relieve occasional constipation. Each tablet contains 100 mg of the #1 doctor-recommended stool softener ingredient — docusate sodium. It works to soften dry, hard stool. So your next bowel movement can happen gently and gradually. Within 12 to 72 hours, you should experience gentle constipation and irregularity relief.