“NEVER Use Magnesium If You Are Taking Any of These Medications” — Fact-Check
That headline is too absolute. Magnesium supplements can interact with several medicines, but taking one of those medicines does not automatically mean you can never use magnesium. Often the issue is reduced absorption or a change in magnesium levels, and the solution may be to separate doses or monitor you.
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Office of Dietary Supplements
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Medicines that deserve particular attention
1. Certain antibiotics
Magnesium can bind to tetracyclines such as doxycycline and quinolone antibiotics such as ciprofloxacin and levofloxacin, reducing how much of the antibiotic your body absorbs. NIH guidance recommends taking these antibiotics at least 2 hours before or 4–6 hours after a magnesium-containing supplement.
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Office of Dietary Supplements
2. Oral bisphosphonates
Medicines such as alendronate can have reduced absorption when taken too close to magnesium. Separating them by at least 2 hours can minimize the interaction.
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Office of Dietary Supplements
3. Diuretics (“water pills”)
Some diuretics, including furosemide and hydrochlorothiazide, can increase magnesium loss through the urine. Others, such as amiloride and spironolactone, can decrease magnesium loss. This doesn’t mean magnesium must automatically be avoided; your clinician may need to monitor your levels.
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Office of Dietary Supplements
4. Proton-pump inhibitors (PPIs)
Long-term use of medicines such as esomeprazole or lansoprazole can sometimes cause low magnesium. In some cases, supplementation is actually used to correct the deficiency.
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Office of Dietary Supplements
⚠️ Kidney problems are especially important
Your kidneys remove excess magnesium. People with impaired kidney function can therefore be more susceptible to magnesium accumulation and toxicity. If you have kidney disease, talk with your doctor or pharmacist before taking a magnesium supplement.
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MedlinePlus
Food magnesium is different
Normal magnesium obtained from foods generally isn’t something healthy people need to avoid because they’re taking medication. The interaction concerns are particularly relevant to magnesium supplements and magnesium-containing medicines.
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Office of Dietary Supplements
For adults, the NIH upper limit for magnesium from supplements and medications is generally 350 mg/day, unless a healthcare professional recommends otherwise. Excessive supplemental magnesium can cause diarrhea, nausea, and abdominal cramping; extremely high amounts can cause serious heart problems.
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Office of Dietary Supplements
Bottom line
Don’t stop your medication or magnesium based on this headline alone. Check the specific medication, magnesium product, dose, and timing with a pharmacist or doctor. The FDA recommends telling healthcare professionals about all prescription medicines, OTC medicines, vitamins, minerals, and supplements you’re taking because interactions can change how medicines work.
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fda.gov
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If you give me the names and doses of your medications plus the type of magnesium (magnesium glycinate, citrate, oxide, etc.), I can go through the combinations one by one.
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