Magnesium hydroxide Side Effects
Not all side effects for magnesium hydroxide may be reported. You should always consult a doctor or healthcare professional for medical advice. Side effects can be reported to the FDA here.
For the Consumer
Applies to magnesium hydroxide: chewable tablets, suspension, 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 hydroxide:
Severe allergic reactions (rash; hives; itching; difficulty breathing; tightness in the chest; swelling of the mouth, face, lips, or tongue); loss of appetite; muscle weakness; nausea; slow reflexes; vomiting.
For Healthcare Professionals
Applies to magnesium hydroxide: compounding powder, oral concentrate, oral suspension, oral tablet chewable
Diarrhea may occur and is occasionally severe enough to cause dehydration and electrolyte abnormalities.
Gastrointestinal side effects have included diarrhea and minor gastrointestinal discomfort.
General side effects have included signs and symptoms of hypermagnesemia. These have included hypotension, nausea, vomiting, EKG changes, respiratory depression, mental depression and coma.
Magnesium may be systemically absorbed following administration of magnesium hydroxide. In patients with normal renal function, increased magnesium elimination in the urine occurs and no significant changes in serum magnesium levels would be expected. However, magnesium may accumulate in patients with renal insufficiency.
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