|Trade names||Fleet, Purga, Dulcolax, Brooklax, others|
|oral or rectal|
|Elimination half-life||16 Hours|
|Excretion||primarily in the feces, systemically absorbed drug is excreted in the urine|
|CompTox Dashboard (EPA)|
|Chemical and physical data|
|Molar mass||361.391 g/mol g·mol−1|
|3D model (JSmol)|
|(what is this?)|
Bisacodyl (INN) is an organic compound that is used as a stimulant laxative drug. It works directly on the colon to produce a bowel movement. It is typically prescribed for relief of episodic and chronic constipation and for the management of neurogenic bowel dysfunction, as well as part of bowel preparation before medical examinations, such as for a colonoscopy.
Bisacodyl is marketed under the trade names Dulcolax/Durolax, Muxol, Fleet, Nourilax, Alophen, Correctol, and Carter's Little Pills (formerly Carter's Little Liver Pills), as well as being available generically. It is usually sold as 5 mg tablets, 10 mg suppositories, or 5 mg pediatric suppositories. It is also available as a 1.25 US fluid ounces (37 ml) pre-packaged enema containing a 10 mg delivered dose of liquid bisacodyl.
When bisacodyl is administered orally, it is usually taken at bedtime. Oral administration is known to produce no action for more than eight hours and then to work suddenly and relatively quickly. This is especially true if more than 10 mg is taken at one time. Normally, the dosage is 5 or 10 mg, but up to 30 mg can be taken for complete cleansing of the bowel before a procedure.
When administered rectally in suppository form, it is usually effective in 15 to 60 minutes. For optimal use, if used as a suppository, it is recommended that bisacodyl be given after breakfast to synchronize with the gastrocolic reflex. Two suppositories can be inserted at once if a very strong, purgative, enema-like result is needed. A few hours after the initial evacuation, there can be a secondary action which will continue as long as there is unexpelled bisacodyl present in the rectum.
Mechanism of action
Bisacodyl works by stimulating enteric nerves to cause peristalsis, i.e., colonic contractions. It is also a contact laxative; it increases fluid and salt secretion. The action of bisacodyl on the small intestine is negligible; stimulant laxatives mainly promote evacuation of the colon.
- Wexner, S. D.; Beck, D. E.; Baron, T. H.; Fanelli, R. D.; Hyman, N.; Shen, B.; Wasco, K. E.; American Society of Colon and Rectal Surgeons; American Society for Gastrointestinal Endoscopy; Society of American Gastrointestinal and Endoscopic Surgeons (2006). "A consensus document on bowel preparation before colonoscopy: prepared by a task force from the American Society of Colon and Rectal Surgeons (ASCRS), the American Society for Gastrointestinal Endoscopy (ASGE), and the Society of American Gastrointestinal and Endoscopic Surgeons (SAGES)". Gastrointestinal Endoscopy. 63 (7): 894–909. doi:10.1016/j.gie.2006.03.918. ISSN 0016-5107. PMID 16733101.
- Wald, A (January 2016). "Constipation: Advances in Diagnosis and Treatment". JAMA (Review). 315 (2): 185–91. doi:10.1001/jama.2015.16994. PMID 26757467.
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- Evans, I. Lynn, "Methods and techniques: The use of Bisacodyl suppositories in preparation for sigmoidoscopy", Gut, British Medical Journal, 1964, 5, 271
- "Medicine: Cut Out the Liver". Time. 1951-04-16. Retrieved 2010-04-26.
- Robert Engelhorn, Ernst Seeger and Jan H. Zwaving "Laxatives" in Ullmann's Encyclopedia of Industrial Chemistry, Wiley-VCH, Weinheim, 2000. doi:10.1002/14356007.a15_183