Is Magnesium Safe with Doxycycline?
Free · No account · based on published sources including NIH ODS, FDA drug labels, and peer-reviewed literature
Separate magnesium supplement intake by at least 2 hours from Doxycycline to minimize the chelation effect.
Why this interaction occurs
Magnesium forms chelate complexes with tetracyclines including Doxycycline, reducing GI absorption and potentially lowering therapeutic drug plasma levels.
Evidence
Evidence level: moderate.
Reported safety data
The FDA’s adverse event reporting system (FAERS) has received 72,559 reports mentioning Doxycycline. This reflects reported cases involving the medication in general — not confirmed causation, and not specific to the Doxycycline + supplement combination on this page.
FAERS reports are voluntary and cannot prove that a drug caused an event. Do not use report counts to assess the safety of this specific drug-supplement pair.
Frequently asked questions
Related interactions
All Magnesium interactions → · All Doxycycline interactions →
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Educational only — not medical advice.
Always confirm with your doctor or pharmacist.