Calcium Carbonate / Famotidine / Magnesium Hydroxide
This combination medication provides triple-action relief for heartburn, acid indigestion, and sour stomach. It works through both neutralizing existing stomach acid and reducing acid production. The formulation combines immediate antacid relief with longer-lasting acid suppression.
A triple-action antacid combining calcium, an H2 blocker, and magnesium for heartburn and acid-related discomfort.
Key facts at a glance
- RxNorm
- 691005
- Generic
- Calcium Carbonate / Famotidine / Magnesium Hydroxide
- Class
- multi-ingredient
- Brands
- Duo Fusion, Pepcid Complete, Tums Dual Action
- 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.
Treats occasional heartburn, acid indigestion, sour stomach, and upset stomach associated with acid reflux or overeating. Used for symptomatic relief of conditions involving excess stomach acid.
Calcium carbonate and magnesium hydroxide neutralize existing stomach acid for quick relief, while famotidine blocks H2 histamine receptors to reduce acid production, providing longer-lasting symptom control.
Do not use for more than 2 weeks continuously unless directed by a physician. Take 2 hours before or after other medications to avoid absorption issues. Consult a doctor before use if pregnant, nursing, or taking prescription acid reducers. May cause constipation (calcium) or diarrhea (magnesium). Those with kidney disease should seek medical advice before use.
Official drug label
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This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.
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