Bismuth Subnitrate / Calcium Carbonate / Magnesium Carbonate
This combination medication works as an antacid and anti-diarrheal agent to relieve symptoms of heartburn, acid indigestion, upset stomach, and diarrhea. It contains bismuth subnitrate, which helps protect the stomach lining and reduce bacterial growth, along with calcium and magnesium carbonates that neutralize excess stomach acid. The mineral combination provides balanced relief from multiple digestive discomforts.
A combination antacid and anti-diarrheal medication used to treat heartburn, indigestion, and diarrhea by neutralizing stomach acid and protecting the digestive tract.
Key facts at a glance
- RxNorm
- 690608
- Generic
- Bismuth Subnitrate / Calcium Carbonate / Magnesium Carbonate
- Class
- multi-ingredient
- Brands
- —
- Availability
- rx
- Lactation
- unknown
- Routes
- —
- Forms
- —
- Regions
- US, EU, CN, JP
- Monitoring
- —
This page is for informational purposes only.
Do not use this information to diagnose yourself or to replace a physician's advice. Always consult a qualified healthcare provider before starting, stopping, or changing any medication. If you believe you are experiencing a medical emergency, call your local emergency number immediately.
Relief of heartburn, acid indigestion, upset stomach, diarrhea, and gas-related discomfort. May also be used for mild stomach ulcers and gastritis symptoms.
Calcium and magnesium carbonates act as antacids by neutralizing hydrochloric acid in the stomach, while bismuth subnitrate provides a protective coating over the stomach lining and may help inhibit certain bacteria. The combination works synergistically to address multiple digestive symptoms.
May cause darkening of stool or tongue, which is harmless. Avoid taking within 1-2 hours of other medications as antacids can affect absorption. Not recommended for use in children with viral diarrhea due to potential Reye's syndrome risk. Consult a healthcare provider if symptoms persist beyond two weeks or if you have kidney disease.
Official drug label
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This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.
If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.
Medically reviewed by WellAlly Editorial Team Last reviewed August 28, 2026. · Read our editorial policy