Mag-Carb Side Effects
Generic Name: magnesium carbonate
Medically reviewed by Drugs.com. Last updated on Sep 15, 2020.
Note: This document contains side effect information about magnesium carbonate. Some of the dosage forms listed on this page may not apply to the brand name Mag-Carb.
For the Consumer
Applies to magnesium carbonate: oral liquid
What are some side effects that I need to call my doctor about right away?
WARNING/CAUTION: Even though it may be rare, some people may have very bad and sometimes deadly side effects when taking a drug. Tell your doctor or get medical help right away if you have any of the following signs or symptoms that may be related to a very bad side effect:
- Signs of an allergic reaction, like rash; hives; itching; red, swollen, blistered, or peeling skin with or without fever; wheezing; tightness in the chest or throat; trouble breathing, swallowing, or talking; unusual hoarseness; or swelling of the mouth, face, lips, tongue, or throat.
- Severe diarrhea.
What are some other side effects of this drug?
All drugs may cause side effects. However, many people have no side effects or only have minor side effects. Call your doctor or get medical help if any of these side effects or any other side effects bother you or do not go away:
These are not all of the side effects that may occur. If you have questions about side effects, call your doctor. Call your doctor for medical advice about side effects.
You may report side effects to the FDA at 1-800-332-1088. You may also report side effects at https://www.fda.gov/medwatch.
For Healthcare Professionals
Applies to magnesium carbonate: compounding powder, oral capsule, oral liquid, oral suspension
Symptoms of magnesium toxicity include hypotension, nausea, vomiting, facial flushing, urinary retention, ileus, depression, and lethargy, which may progress to muscle weakness, dyspnea, extreme hypotension, arrhythmia, and cardiac arrest.[Ref]
Frequency not reported: Hypotension, extreme hypotension, arrhythmia, cardiac arrest[Ref]
Frequency not reported: Vomiting, nausea, ileus, abdominal cramping[Ref]
Frequency not reported: Muscle weakness[Ref]
Frequency not reported: Depression[Ref]
Frequency not reported: Dyspnea[Ref]
Frequency not reported: Lethargy[Ref]
Frequency not reported: Facial flushing[Ref]
Frequency not reported: Urinary retention[Ref]
1. National Institutes of Health "Magnesium: Fact sheet for Health Professionals. Available from: URL: 371109" ([2018, Sep 26]):
More about Mag-Carb (magnesium carbonate)
- Other brands
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Some side effects may not be reported. You may report them to the FDA.