Senna is an over-the-counter (OTC) laxative. It is used to treat constipation and also to clear the bowel before diagnostic tests such as colonoscopy. What is liquid senna? Naturally and Artificially Flavor. 8 FL OZ (237 mL) CVS Health™ Senna Laxative is an easy-to-take, natural vegetable laxative that provides gentleRead More →