Mag-Ox 400: Uses, Dosage, Side Effects, and Precautions
Mag-Ox 400 is an over-the-counter magnesium oxide product used to relieve occasional constipation and symptoms such as heartburn, indigestion, or upset stomach. Each tablet contains 400 mg of magnesium oxide, which provides magnesium and acts as both a laxative and an antacid.
Mag-Ox 400 can provide short-term relief from occasional constipation or acid-related stomach symptoms. Follow the package directions, do not use it longer than 7 days for constipation unless advised, and ask a doctor or pharmacist if you take other medicines or have kidney disease.
Key facts at a glance
- RxNorm
- 93204
- Generic
- Mag-Ox 400
- Class
- brand-name
- 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.
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 July 26, 2026. · Read our editorial policy