MagGel Side Effects
Generic Name: magnesium oxide
Note: This page contains information about the side effects of magnesium oxide. Some of the dosage forms included on this document may not apply to the brand name MagGel.
For the Consumer
Applies to magnesium oxide: capsules, tablets
Check with your doctor if any of these most COMMON side effects persist or become bothersome:
Seek medical attention right away if any of these SEVERE side effects occur while taking magnesium oxide (the active ingredient contained in MagGel)
Severe allergic reactions (rash; hives; itching; difficulty breathing; tightness in the chest; swelling of the mouth, face, lips, or tongue); black, tarry stools; nausea; slow reflexes; vomit that looks like coffee grounds.
For Healthcare Professionals
Applies to magnesium oxide: compounding powder, oral capsule, oral tablet
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]
Frequency not reported: Diarrhea, nausea, abdominal cramping[Ref]
1. National Institutes of Health (NIH) "Magnesium: fact sheet for health professionals. Available from: URL: https://ods.od.nih.gov/factsheets/Magnesium-HealthProfessional/" ([2016, Feb 11]):
2. Guerrera MP, Volpe SL, Mao JJ "Therapeutic uses of magnesium." Am Fam Physician 80 (2009): 157-62
Not all side effects for MagGel may be reported. You should always consult a doctor or healthcare professional for medical advice. Side effects can be reported to the FDA here.
More about MagGel (magnesium oxide)
- Side Effects
- During Pregnancy or Breastfeeding
- Dosage Information
- Drug Interactions
- Support Group
- En Español
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- Drug class: minerals and electrolytes
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