Bisacodyl: Effects, Dosage and Side Effects
Bisacodyl is a well-established laxative used for the short-term treatment of constipation and for bowel cleansing before medical procedures. It acts directly in the large intestine.
Things worth knowing about "Bisacodyl"
Bisacodyl is a well-established laxative used for the short-term treatment of constipation and for bowel cleansing before medical procedures. It acts directly in the large intestine.
What is Bisacodyl?
Bisacodyl is a synthetic laxative belonging to the class of stimulant laxatives. It has been used for decades in the short-term treatment of constipation and is available over the counter in pharmacies in many countries. Bisacodyl is also widely used for bowel preparation prior to diagnostic or surgical procedures such as colonoscopy.
Mechanism of Action
Bisacodyl is a stimulant laxative that exerts its effects after enzymatic activation in the large intestine. The active compound inhibits water reabsorption from intestinal contents while simultaneously stimulating intestinal contractions (peristalsis), resulting in accelerated stool transit and softer stools.
Bisacodyl is a prodrug, meaning it is converted into its active form in the gut by intestinal bacteria and enzymes. This active metabolite stimulates the nerve endings of the intestinal wall and promotes secretion of water and electrolytes into the bowel lumen.
Indications
- Short-term treatment of constipation in adults and children aged 2 years and above (suppositories) or 4 years and above (tablets)
- Bowel cleansing before colonoscopy, rectoscopy, or intestinal surgery
- Supportive treatment in patients with temporarily reduced bowel motility, such as after surgery or in bedridden patients
Dosage Forms and Dosing
Tablets
Bisacodyl tablets are typically coated with an enteric coating to prevent release in the stomach and ensure activation in the colon. The usual adult dose is 5–10 mg (1–2 tablets) once daily, preferably taken in the evening to produce a bowel movement the following morning. Tablets should be swallowed whole with plenty of water and must not be chewed or crushed. Milk and antacids should be avoided at the time of ingestion as they can dissolve the coating prematurely.
Suppositories
Bisacodyl suppositories act more quickly than tablets, with the onset of action typically occurring within 15–60 minutes of administration. The standard adult dose is one suppository containing 10 mg of bisacodyl. Lower-strength suppositories are available for children.
Side Effects
Bisacodyl is generally well tolerated when used for short periods. Possible side effects include:
- Abdominal cramps and pain
- Nausea
- Diarrhea (with overdose)
- Rectal irritation or burning (particularly with suppositories)
- Electrolyte imbalances with prolonged or excessive use, particularly low potassium levels (hypokalemia)
Contraindications and Warnings
Bisacodyl must not be used in the following conditions:
- Intestinal obstruction (ileus)
- Acute inflammatory bowel disease (e.g., Crohn's disease, ulcerative colitis in an acute flare)
- Acute abdomen (e.g., appendicitis)
- Known hypersensitivity to bisacodyl
- Severe dehydration
Use during pregnancy should only be considered following consultation with a healthcare professional. Continuous use for more than 2 weeks without medical supervision is not recommended, as it may lead to dependency and a condition known as laxative-induced colon (cathartic colon).
Drug Interactions
- Concurrent use of antacids or milk may dissolve the enteric coating of tablets prematurely, leading to gastric irritation and cramping.
- Simultaneous use of diuretics or corticosteroids may increase the risk of hypokalemia.
- Digoxin and other cardiac glycosides: bisacodyl-induced hypokalemia may potentiate their effects, increasing the risk of cardiac side effects.
References
- European Medicines Agency (EMA): Assessment report on Bisacodyl, EMA/HMPC/417905/2008.
- Camilleri M. et al. - Chronic Constipation. New England Journal of Medicine, 2019; 381:1560–1572.
- World Gastroenterology Organisation (WGO): Global Guidelines on Constipation, 2010. Available at: www.worldgastroenterology.org
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