What it is used for
- Indigestion, nausea, and upset stomach
- Mild diarrhea, including some travellers' diarrhea
- Heartburn and a feeling of fullness
- Part of some Helicobacter pylori treatment combinations
How it works
Bismuth subsalicylate coats and soothes the stomach lining, reduces inflammation and fluid loss in the gut, and has a mild action against some bacteria, helping with upset stomach and diarrhea.
How it is taken
Comes as chewable tablets and oral liquid. It is taken by mouth when symptoms occur. Take it exactly as the label directs; it can harmlessly darken the tongue and stools, which is not a cause for concern.
No doses here on purpose. The right strength and schedule depend on you — only a doctor or pharmacist should set them. Always follow your prescription and the label.
Common side effects
- Temporary black discolouration of the tongue and stools (harmless)
- Constipation
- Nausea
Serious effects — get help
- Signs of a salicylate (aspirin-like) reaction such as ringing in the ears, especially with high amounts
- Severe allergic reaction
- Black stools that could be confused with bleeding — seek advice if you also feel unwell or have stomach pain
- Worsening diarrhea with high fever or blood needs medical care
If a reaction is severe — for example trouble breathing, swelling of the face or throat, or collapse — go to the nearest emergency room now or call your local emergency number. Do not wait for an online consultation.
Interactions to watch
- Aspirin and other salicylates (added effect)
- Blood thinners such as warfarin
- Some diabetes medicines
- Certain antibiotics and other drugs whose absorption can be affected
Who should take care
- Avoid in children and teenagers recovering from viral illnesses such as flu or chickenpox, due to a rare serious condition (Reye's syndrome) linked to salicylates
- Avoid if you are allergic to aspirin or other salicylates
- Tell your clinician if you have a bleeding disorder, ulcers, or take blood thinners
- Discuss pregnancy and breastfeeding with a pharmacist, as it is generally not advised
- See a clinician for diarrhea with fever or blood, or symptoms lasting beyond a couple of days