Laxatives: What They Do, Medicines
Laxatives are medicines that help the bowel to empty and relieve constipation. They work in different ways: some draw water into the bowel, some add bulk, and some stimulate the bowel muscles. They are meant for short-term use. Food, fluids and activity come first.
Pharmacist review in progress. This page is based on the sources listed below and is being checked by our registered pharmacist.
How do Laxatives work?
Osmotic laxatives such as lactulose draw water into the bowel so the stool becomes softer and easier to pass. Other laxatives add bulk to the stool or stimulate the bowel muscles.
Active ingredients of this type
These active ingredients belong to Laxatives. They are listed A to Z.
- Lactulose: Lactulose is an osmotic laxative, a medicine that softens stools by drawing water into the bowel.
Common questions
Can I take a laxative every day?
Laxatives are meant for short-term use. If you need one regularly, see a doctor to find the reason for the constipation. Some laxatives, if overused, can upset body salts. Ask your doctor or pharmacist what suits you.
How quickly does a laxative work?
It depends on the type. Some work within hours, while osmotic laxatives such as lactulose can take a day or two, sometimes up to 3 days. See a doctor if constipation does not improve or gets worse.
Can laxatives be used in children or in pregnancy?
Some can, but the choice depends on age and circumstances. Do not give a child a laxative without a doctor's or pharmacist's advice. In pregnancy, ask a doctor or pharmacist before taking one.
Sources
- Lactulose: a laxative for constipation. NHS (UK)
- Constipation. NHS (UK)
- ATC/DDD Index: A06AD11 lactulose. WHO Collaborating Centre for Drug Statistics Methodology