Other Information: Each Tablet Contains: calcium 10 mg. Store at 77 degrees F (25 degrees C). Excursions permitted between 59-86 degrees F (15-30 degrees C). Misc: Standardized senna concentrate and docusate sodium. Works gently. Works overnight. Natural vegetable laxative ingredient plus stool softener. Works in 6-12 hrs. Comfort Promise: Purified senna. The Senokot-S Laxative Comfort Promise: For your comfort, the active ingredient in Senokot-S Laxatives is always purified senna, manufactured to high quality standards. Visit our website: www.senokot.com.