What Is Bisacodyl? Uses, Dosage, and What You Need to Know in 2026

Bisacodyl is one of the most widely used laxatives in the world, sold under brand names like Dulcolax, Correctol, and Fleet. Whether you're dealing with occasional constipation or preparing for a colonoscopy, bisacodyl is a well-established, fast-acting option. This guide covers everything you need to know about bisacodyl in 2026 — what it is, how it works, how to take it, and who should avoid it.

What Is Bisacodyl?

Bisacodyl is a stimulant laxative belonging to the diphenylmethane chemical family. It's available over the counter without a prescription under several brand names. Bisacodyl is the generic name — the active ingredient found in Dulcolax stimulant laxative tablets, Correctol, Fleet Bisacodyl, and many store-brand laxatives.

The drug was developed in the 1950s and has been used for over 70 years. It is not a controlled substance and does not require a prescription.

What Is Bisacodyl Used For?

Bisacodyl is FDA-approved for:

Occasional constipation relief: For short-term relief when lifestyle measures (fiber, hydration, exercise) haven't been sufficient.

Bowel preparation before colonoscopy: Bisacodyl is a standard component of many colonoscopy prep protocols — both oral tablets and suppositories are used depending on the protocol.

Pre- and post-surgical bowel preparation: Used in surgical prep protocols requiring bowel evacuation.

Off-label uses include neurogenic bowel management (spinal cord injury, MS), opioid-induced constipation, and constipation following prolonged bed rest.

What Are the Available Forms of Bisacodyl?

Oral delayed-release (enteric-coated) tablets — 5 mg: Most common form. Taken at bedtime for a bowel movement the next morning. Works in 6–12 hours.

Rectal suppositories — 10 mg (adult), 5 mg (pediatric): Works in 15–60 minutes. Used when faster results are needed or when oral intake is not possible.

Rectal enema — 10 mg/30 mL: Works in 5–20 minutes. Less commonly used; sometimes employed in institutional settings.

Bisacodyl Dosing Guide

Always follow the directions on the package or from your healthcare provider. Typical doses:

Adults and children 12+: 5–15 mg orally (1–3 tablets) once daily, OR 10 mg rectally (1 adult suppository) once daily

Children 6–11 years: 5 mg orally (1 tablet) once daily, OR 5–10 mg rectally

Children 2–5 years (rectal only): 5 mg (pediatric suppository) rectally once daily

Do not take more than the maximum recommended dose or use for more than 1 week without speaking to your doctor.

How to Take Bisacodyl Tablets (Important Instructions)

Swallow tablets WHOLE with a full glass of water — never crush, chew, or split

Do NOT take within 1 hour of antacids, dairy products (milk, yogurt), or proton pump inhibitors — these dissolve the enteric coating prematurely and cause gastric irritation

Take at bedtime for a bowel movement the following morning — this aligns with the 6–12 hour onset

Start with the lowest dose (1 tablet = 5 mg) and only increase if needed

Who Should NOT Take Bisacodyl?

Bisacodyl is contraindicated in people with:

GI obstruction, bowel perforation, or appendicitis

Toxic megacolon or toxic colitis

Severe dehydration or electrolyte imbalance

Rectal bleeding (seek medical evaluation first)

Allergy to bisacodyl or any product ingredient

For a deeper explanation of how bisacodyl works at a biological level, see our article on how Bisacodyl works.