Guide

Medicines for gastrointestinal problems

Prepared by the LekCheck team · Last reviewed: 2026-06-27 · How we create our content

Mild gastrointestinal complaints often respond to over-the-counter remedies aimed at the specific symptom. Below are the active ingredients most commonly used; choose one to see products and prices. For persistent or severe symptoms, consult 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.

Heartburn and reflux

For heartburn and acid reflux, proton pump inhibitors such as omeprazole or pantoprazole are used, as well as antacids (e.g. magnesium hydroxide or calcium carbonate) for quick relief. For frequent or persistent complaints, see a doctor.

Diarrhoea

For acute diarrhoea, loperamide and adsorbents such as diosmectite are used, together with enough fluids for rehydration. Loperamide is not suitable for all types of diarrhoea (e.g. an infection with high fever or blood). See a doctor for blood in the stool, high fever, severe pain, or in small children and older adults.

Constipation

For constipation, laxatives such as lactulose or bisacodyl are used, alongside more fluids and fibre. Prolonged use of laxatives requires medical assessment.

Gas and bloating

For gas and bloating, simethicone is often used, which reduces gas bubbles in the gut.

When to see a doctor

See a doctor for persistent complaints, blood in the stool, vomiting blood, black stools, severe dehydration, inability to keep fluids down, severe or increasing pain, unexplained weight loss, or if the symptoms are in a child, a pregnant woman or someone with a chronic condition. Suitability in children and pregnancy depends on the specific ingredient.