Laxative
Bisacodyl
Tablet or suppository
Quick Summary
Bisacodyl stimulates the bowel muscles to move stool along.
Constipation
Bowel preparation
Medical Uses
Constipation: Short-term.
Bowel preparation: Before some procedures.
How it's taken
Tablets are often taken at night; swallow whole and don't take with milk or antacids.
Your doctor decides the right dose for you and how long to take it.
Your doctor decides the right dose for you. Follow their instructions and the label.
Common Side Effects
Tummy cramps
Common.
Diarrhoea
If too much is taken.
Weakness
With overuse.
Interactions
Antacids and milk
Can make the tablet dissolve too early.
Critical Warnings
Short-term only
Regular use can cause dependence and salt imbalance.
Severe tummy pain
Black Box Warning: Don't use with severe pain or suspected blockage.
Sources and further reading
Last updated 21 October 2026. For more detail, see these trusted health organisations.
- Bisacodyl: drug information(opens in a new tab) · MedlinePlus, US National Library of Medicine
- Bisacodyl: a laxative taken to treat constipation(opens in a new tab) · NHS