Senna
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Evidence Summary
Senna is a stimulant laxative primarily used for bowel preparation for colonoscopy and the management of various forms of constipation. Research, including meta-analyses, demonstrates its efficacy in bowel cleansing and as a treatment for chronic constipation in pediatric, geriatric, and postpartum populations.
Evidence by Condition
Senna is an effective agent for bowel preparation for colonoscopy, with studies comparing its efficacy to polyethylene glycol (PEG).
Senna and senna-fiber combinations have been shown to be effective in treating chronic constipation in elderly and geriatric patients.
Senna is used as a laxative therapy in children, particularly for constipation related to anorectal malformations.
Clinical trials have assessed the use of standardized senna for managing constipation during the puerperium.
Effective Doses
Specific dose ranges are not explicitly provided in the reviewed abstracts, though 'split high-dose' regimens are mentioned in comparative studies.
Key Findings
- Senna is an effective method for bowel preparation for colonoscopy (PMID: 35758925).
- Super-low volume polyethylene glycol is as effective as senna for colonoscopy bowel preparation (PMID: 34159460).
- Senna-fiber combinations have been compared to lactulose for treating chronic constipation in long-stay elderly patients (PMID: 8219947).
- Research has investigated the potential genotoxic risk associated with senna products (PMID: 9020301).
Limitations
Much of the available research focuses on comparative efficacy against other laxatives (like PEG or lactulose) rather than establishing standalone dosing standards, and some clinical evidence is quite dated.
Safety & Interactions
Research has been conducted to assess the genotoxic risk of senna products (PMID: 9020301); additionally, there are concerns regarding product adulteration in some natural health products (PMID: 25425095).
AI-generated summary from 14 peer-reviewed studies. Not medical advice. Always consult a healthcare provider.
Claims vs. Evidence
| Claim Type | % of Products | Evidence Required | Status |
|---|---|---|---|
| All Other | 100% | Tier D (Unclassified) | ✅ Supported |
| Structure/Function | 87% | Tier C (DSHEA Structure/Function (no pre-approval)) | ⚠️ Unsupported |
| Nutrient | 5% | Tier D (Unknown) | ✅ Supported |
Research by Topic
Research Evidence (14)
**Tian et al., Unknown** | Gastroenterol Nurs | Meta Analysis Tian Hefeng, Fan Ying, ... Wang Xiu. The Efficacy of Senna Bowel Preparation for Colonoscopy: A Systematic Review and Meta-analysis. Gastroenterol Nurs. ;45(6):428-439. doi:10.1097/SGA.000...
**Ishibashi et al., 2022** | Surg Endosc | Rct Ishibashi Fumiaki, Tanaka Ryu, ... Baba Satoshi. Pre-administration of super-low volume polyethylene glycol is as effective as senna laxative as bowel preparation for colonoscopy: a randomized controlled...
**Coskun et al., 2020** | J Gastroenterol Hepatol | Rct Coskun Yusuf, Yuksel Ilhami. Polyethylene glycol versus split high-dose senna for bowel preparation: A comparative prospective randomized study. J Gastroenterol Hepatol. 2020-Nov;35(11):1923-192...
**Passmore et al., 1993** | BMJ | Rct Passmore A P, Wilson-Davies K, ... Scott M E. Chronic constipation in long stay elderly patients: a comparison of lactulose and a senna-fibre combination. BMJ. 1993-Sep-25;307(6907):769-71 OBJECTIVES: To compare ...
**Morishita et al., 2021** | Am J Gastroenterol | Rct Morishita Daisuke, Tomita Toshihiko, ... Miwa Hiroto. Senna Versus Magnesium Oxide for the Treatment of Chronic Constipation: A Randomized, Placebo-Controlled Trial. Am J Gastroenterol. 2021-Jan-0...
**Terry et al., 2013** | J Pediatr Gastroenterol Nutr | Rct Terry Natalie A, Chen-Lim Mei Lin, ... Mamula Petar. Polyethylene glycol powder solution versus senna for bowel preparation for colonoscopy in children. J Pediatr Gastroenterol Nutr. 2013-Fe...
**Santos-Jasso et al., 2017** | J Pediatr Surg | Rct Santos-Jasso Karla Alejandra, Arredondo-García José Luis, ... Lezama-Del Valle Pablo. Effectiveness of senna vs polyethylene glycol as laxative therapy in children with constipation related to anor...
**Shelton et al., 1980** | S Afr Med J | Rct Shelton M G. Standardized senna in the management of constipation in the puerperium: A clinical trial. S Afr Med J. 1980-Jan-19;57(3):78-80 Successful treatment of constipation in the immediate postpartum ...
**Kinnunen et al., 1993** | Pharmacology | Rct Kinnunen O, Winblad I, ... Salokannel J. Safety and efficacy of a bulk laxative containing senna versus lactulose in the treatment of chronic constipation in geriatric patients. Pharmacology. 1993-Oct;47...
**Seethapathy et al., 2015** | Int J Legal Med | Other Seethapathy Gopalakrishnan Saroja, Ganesh Doss, ... Ravikanth Gudasalamani. Assessing product adulteration in natural health products for laxative yielding plants, Cassia, Senna, and Chamaecrista...
**Sakulpanich et al., 2009** | Southeast Asian J Trop Med Public Health | Other Sakulpanich Aurapa, Gritsanapan Wandee. Laxative anthraquinone contents in fresh and cooked Senna siamea leaves. Southeast Asian J Trop Med Public Health. 2009-Jul;40(4):...
**DUNCAN et al., 1957** | Br Med J | Other DUNCAN A S. Standardized senna as a laxative in the puerperium; a clinical assessment. Br Med J. 1957-Feb-23;1(5016):439-41 *No abstract available* *Requires manual extraction from full text* - *Requires man...
**Unknown et al., 1992** | Pharmacology | Other . Classification of senna as a laxative. Pharmacology. 1992;44 Suppl 1:6-9 *No abstract available* *Requires manual extraction from full text* - *Requires manual extraction*
**Brusick et al., 1997** | Environ Mol Mutagen | Narrative Review Brusick D, Mengs U. Assessment of the genotoxic risk from laxative senna products. Environ Mol Mutagen. 1997;29(1):1-9 Laxative senna products and several of their specific components ...
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Frequently Asked Questions
What is Senna and what is it used for?
Senna is a stimulant laxative used primarily for bowel preparation before a colonoscopy and for managing various types of constipation. It is also used in specific medical contexts for pediatric and geriatric populations.
Does Senna work for colonoscopy preparation?
Yes, there is strong evidence that Senna is an effective agent for bowel preparation for a colonoscopy. Research indicates its efficacy is comparable to polyethylene glycol (PEG).
Is Senna effective for chronic constipation in the elderly?
There is moderate evidence that Senna, especially when used in combination with fiber, is effective for treating chronic constipation in elderly and geriatric patients. It has been compared to treatments like lactulose in long-stay elderly populations.
Can Senna be used for constipation in children?
There is moderate evidence supporting the use of Senna as a laxative therapy in children. It is particularly used for managing constipation related to anorectal malformations.
Is Senna safe to take?
Research has investigated the potential genotoxic risk associated with Senna products. Additionally, there are some concerns regarding the potential for product adulteration in certain natural health products.
Are there any drug interactions with Senna?
There are currently no documented drug interactions for Senna in the available research. However, you should always consult a healthcare provider before starting a new supplement.
What is the effective dose of Senna?
Specific effective dose ranges are not explicitly provided in the reviewed research. However, some comparative studies have mentioned the use of 'split high-dose' regimens.
Is Senna effective for postpartum constipation?
There is currently insufficient evidence to confirm the effectiveness of Senna for managing constipation during the postpartum period (puerperium). While clinical trials have assessed standardized senna, more research is required.
Answers generated from research evidence. Not medical advice.