Calcium Carbonate / Phenobarbital
Calcium Carbonate/Phenobarbital is a combination medication that pairs an antacid with a barbiturate sedative. Calcium carbonate neutralizes stomach acid to help relieve heartburn and indigestion symptoms, while phenobarbital provides calming effects. This combination has been used for conditions such as gastric or duodenal ulcers where both acid reduction and sedation may be beneficial.
A combination antacid-sedative medication used for digestive conditions requiring both acid neutralization and calming effects.
Key facts at a glance
- RxNorm
- 691018
- Generic
- Calcium Carbonate / Phenobarbital
- 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.
Treatment of gastric and duodenal ulcers, gastritis, and other conditions involving excess stomach acid when anxiety or nervous tension may be contributing to symptoms.
Calcium carbonate works by neutralizing gastric acid in the stomach, raising pH to reduce acidity and discomfort. Phenobarbital, a barbiturate, acts as a sedative by enhancing the effects of GABA in the central nervous system, promoting calmness and reducing tension.
Phenobarbital can cause drowsiness and dependence with prolonged use. May interact with other CNS depressants, blood thinners, and certain heart medications. Calcium carbonate may affect absorption of other drugs. Should be used with caution in patients with respiratory depression, liver disease, or history of substance abuse. Avoid alcohol while taking this medication.
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