What is Senna Remedica? Treating constipation. Senna Remedica is a stimulant laxative. It works by irritating bowel tissues, resulting in bowel movements. Short-term treatment of constipation; preoperative and preradiographic bowel evacuation for procedures involving GI tract. How should I use Senna Remedica? Use Senna Remedica as directed by your doctor. Check the label on the medicine for exact dosing instructions. Take Senna Remedica by mouth with or without food. Take Senna Remedica with a full glass of water (8 oz/240 mL). Drink extra fluids while you are taking Senna Remedica, unless instructed differently by your doctor. It is best to take Senna Remedica at bedtime. If you miss a dose of Senna Remedica, take it as soon as possible. If it is almost time for your next dose, skip the missed dose and go back to your regular dosing schedule. Do not take 2 doses at once. Ask your health care provider any questions you may have about how to use Senna Remedica.