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Friday, January 23, 2009 Luci, Community Member, asks

Q: magnesium side effect


My doctor told me to take 1000mg of magnesium oxide each day to prevent migraines. He told me to start at 500 and work up to the 1000 because it can cause diarrhea. Oh, yeah! For those who have used it, how long does it usually take for the diarrhea to stop? Any tips?

Thank you,


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Answers (2)
Teri Robert, Health Guide
1/24/09 12:44pm



I know that problem well! For me, the diarrhea lasted about a week or 10 days. I waited a few days before upping my dose.


If you take a multi-vitamin or other supplements, check them to see if they contain magnesium. If they do, check with your doctor to see if he wants to lower you magnesium oxide dosage.


Good luck!

jay, Community Member
2/ 2/09 12:01pm
Dear Luci, I take 400 mg of magnesium twice a day and don't have that problem,maybe because i take another drug which induces constipation.So,maybe it kind of balances out. I think you are the one who answered my question on apple cider vinegar.Thank you for answering.Which brand of vinegar did you try? Was it distilled or, with the mother, which is undistilled? thank you,jay Reply
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By Luci, Community Member— Last Modified: 12/18/10, First Published: 01/23/09