Is Magnesium Safe with Verapamil?
Free · No account · based on published sources including NIH ODS, FDA drug labels, and peer-reviewed literature
Avoid high-dose magnesium supplementation without direct physician supervision. IV magnesium in clinical settings with verapamil has caused cardiac arrest. Report any palpitations, weakness, or fainting immediately.
Why this interaction occurs
Both magnesium and verapamil inhibit calcium-dependent cardiac conduction and vascular smooth muscle contraction. Their combined use, especially at higher doses, markedly increases the risk of AV block, bradycardia, severe hypotension, and neuromuscular blockade.
Evidence
Evidence level: moderate.
Reported safety data
The FDA’s adverse event reporting system (FAERS) has received 41,693 reports mentioning Verapamil. This reflects reported cases involving the medication in general — not confirmed causation, and not specific to the Verapamil + 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 Verapamil interactions →
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Educational only — not medical advice.
Always confirm with your doctor or pharmacist.