Senna
Short-term constipation relief from Senna alexandrina
FDA Disclaimer: These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease. Always consult your physician before starting any supplement.
Senna is a stimulant laxative intended for short-term use only (7–10 days maximum without medical supervision). Long-term daily use can cause laxative dependence, electrolyte imbalances (especially potassium), and may cause colon changes. Do not use if pregnant, nursing, or if you have inflammatory bowel disease. Always follow package directions and consult your doctor if you need a laxative regularly.
Senna (Senna alexandrina) is a flowering plant whose leaves and pods contain compounds called sennosides. These are stimulant laxatives — they irritate the colon lining, increasing muscle contractions that push waste through more quickly. Senna is one of the oldest herbal medicines and is one of the few herbal laxatives with an FDA OTC drug monograph, establishing it as both safe and effective for short-term constipation relief.
Senna is effective. That is not in dispute. But effectiveness and long-term appropriateness are different things. It is a short-term tool for acute constipation — not something to take regularly. In our store, senna was often the “I need it now” recommendation, always paired with a conversation about why addressing the root cause (fiber, hydration, movement) matters more than the quick fix.
Reliable Constipation Relief
One of the most effective OTC laxatives available. Clinical trials consistently show sennosides produce a bowel movement within 6–12 hours in the majority of users.
Bowel Preparation
Used medically before colonoscopy and other GI procedures. Often combined with other agents for bowel prep under medical supervision.
Opioid-Related Constipation
Commonly prescribed alongside opioid pain medications, which cause constipation as a side effect. Often combined with docusate sodium for this purpose.
- Take at bedtime — expect results in the morning
- Drink plenty of water when using senna
- Never use longer than 7–10 days without medical guidance
- After resolving constipation, switch to psyllium + magnesium for long-term gut health
A systematic review by Tramonte et al. (1997) in the Journal of General Internal Medicine found stimulant laxatives including senna to be consistently effective for constipation across controlled trials. Senna is one of the few herbal products with an FDA OTC drug monograph — establishing a legally recognized safety and efficacy profile for short-term use in adults.
How Senna Compares
| Ingredient | Best For | Key Difference |
|---|---|---|
| Senna | Acute constipation, bowel prep | Stimulant laxative; fastest acting; short-term use only |
| Psyllium Husk | Chronic constipation, cholesterol | Bulk-forming fiber; safe for daily use; takes 2–3 days |
| Magnesium Citrate | Constipation, sleep, muscle | Osmotic laxative; gentler than senna; also supports sleep |
| Cascara | Constipation | Also a stimulant laxative; less studied; FDA removed OTC status in 2002 |
For long-term gut health, psyllium husk and magnesium are better choices than stimulant laxatives like senna.
- Tramonte SM, et al. “The Treatment of Chronic Constipation in Adults: A Systematic Review.” J Gen Intern Med. 1997;12(1):15–24. PubMed
- Ramkumar D & Rao SS. “Efficacy and Safety of Traditional Medical Therapies for Chronic Constipation: Systematic Review.” Am J Gastroenterol. 2005;100(4):936–971. PubMed
- Wald A. “Constipation: Advances in Diagnosis and Treatment.” JAMA. 2016;315(2):185–191. PubMed
Evidence-based supplement recommendations from a former physical store owner. No hype. No BS. Just facts.
Download Free PDF