by 
The Curious Bag
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<h4 class="dechead">On One Hand: Doctor's Prescription
Magnesium oxide is prescribed to treat the symptoms of heartburn, acid indigestion, sour stomach, constipation, and gastrointestinal problems. Recommended dosages for these symptoms range from 400 to 800 mg daily. Talk to your doctor to discuss exact dosages and possible side effects or drug interactions.
On the Other: Over the Counter
Magnesium oxide is available without a prescription. Supplement labels should clearly specify recommended dosages to treat differing symptoms. Dosage levels are the same for prescription or over-the-counter sources. Talk to your doctor before starting magnesium oxide or if you experience side effects.
Bottom Line
Dosing instructions that exceed the Food and Drug Administration's recommended daily allowance of 400 mg should be followed exactly as given. Maximum dosage during pregnancy is 350 mg daily. Talk to your doctor or pharmacist before taking magnesium, even if purchased over the counter. Do not take magnesium oxide for more than two weeks. Take all other medications or supplements at least two hours before or after taking magnesium oxide to allow proper absorption.
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