Note: This document contains side effect information about magnesium oxide. Some dosage forms listed on this page may not apply to the brand name Mag-Ox 400.
Applies to magnesium oxide: oral capsule, oral tablet.
Warning
Before you take magnesium oxide, tell your doctor about all your medical conditions or allergies, and all the medicines you are using. Also make sure your doctor knows if you are pregnant or breast-feeding. In some cases, you may not be able to take magnesium oxide, or you may need a dose adjustment or special precautions.
Get emergency medical help if you have signs of an allergic reaction: hives; difficult breathing; swelling of your face, lips, tongue, or throat.
Stop using magnesium oxide (the active ingredient contained in Mag-Ox 400) and call your doctor at once if you have:
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rectal bleeding;
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coughing up blood or vomit that looks like coffee grounds;
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bloody or tarry stools; or
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no bowel movement after using magnesium oxide as a laxative.
Common side effects may include:
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diarrhea; or
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upset stomach.
This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects.
For Healthcare Professionals
Applies to magnesium oxide: compounding powder, oral capsule, oral tablet.
Metabolic
Magnesium toxicity symptoms may include: hypotension, nausea, vomiting, facial flushing, urine retention, ileus, depression, lethargy, muscle weakness, respiratory depression, arrhythmia, cardiac arrest, coma, and death.[Ref]
Frequency not reported: Hypermagnesemia, magnesium toxicity[Ref]
Gastrointestinal
Frequency not reported: Diarrhea, nausea, abdominal cramping[Ref]
