The headline “NEVER use magnesium if you are taking these medications” is too absolute. Magnesium supplements can interact with certain medicines, but in many cases the solution is simply separating the doses, not avoiding magnesium altogether.
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Office of Dietary Supplements
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Medicines that need particular attention
Certain antibiotics — especially doxycycline and other tetracyclines, and antibiotics such as ciprofloxacin or levofloxacin. Magnesium can reduce their absorption. Typically, the antibiotic should be taken at least 2 hours before or 4–6 hours after magnesium.
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Office of Dietary Supplements
Bisphosphonates such as alendronate — magnesium can reduce absorption. They should generally be separated by at least 2 hours.
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Office of Dietary Supplements
Diuretics (“water pills”) — some increase magnesium loss while others decrease it, so the interaction isn’t simply “never take magnesium.”
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Office of Dietary Supplements
Long-term proton-pump inhibitors (PPIs) such as omeprazole or lansoprazole can themselves lower magnesium levels. In some cases supplementation is actually used, with medical monitoring.
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Office of Dietary Supplements
⚠️ Kidney disease is especially important
Healthy kidneys normally remove excess magnesium. Reduced kidney function can allow magnesium to accumulate, potentially causing toxicity, so people with kidney disease should consult their doctor before taking magnesium supplements.
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Office of Dietary Supplements
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Also remember that magnesium from normal foods isn’t generally the concern; the upper limit of 350 mg/day for adults applies to magnesium from supplements and medications, not magnesium naturally present in food.
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Office of Dietary Supplements
Bottom line: Don’t stop a prescribed medication or magnesium supplement based on a viral list. If you tell me which medications you take and the type/dose of magnesium, I can check the specific combinations and explain whether you need to separate them.
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