Guide

Medicines for constipation

Prepared by the LekCheck team · Last reviewed: 2026-06-29 · How we create our content

Constipation often responds to more fluids, fibre and exercise, and when needed to over-the-counter laxatives. Different remedies work in different ways and are not suitable for prolonged use without proper judgement. Below are the commonly used ingredients; choose one to see products and prices. For prolonged constipation or worrying symptoms, see a doctor.

This guide was prepared by the LekCheck team and has not been reviewed by a doctor or pharmacist. This article is for general information only and is not medical advice, diagnosis, or treatment. Do not start, stop, or change any treatment without consulting a doctor or pharmacist.

Osmotic laxatives

Lactulose is an osmotic laxative that retains water in the gut and softens the stool. It acts more gently and is often used over a longer period at one's discretion.

Stimulant laxatives

Bisacodyl is a stimulant laxative with a faster action. Stimulant laxatives are not suitable for daily prolonged use without medical assessment.

When to see a doctor

See a doctor for constipation lasting more than a few weeks, alternating constipation and diarrhoea, blood in the stool, severe abdominal pain, bloating, vomiting, unexplained weight loss, or if the constipation is new and persistent in an older person. Suitability in children and pregnancy depends on the specific ingredient.