Is Magnesium Safe with Ranolazine?
Free · No account · based on published sources including NIH ODS, FDA drug labels, and peer-reviewed literature
Discuss magnesium supplementation with your cardiologist before starting. Hypomagnesemia can worsen QT prolongation associated with ranolazine. Magnesium replacement when deficient may be beneficial, but self-supplementation without testing is not advised.
Why this interaction occurs
Like potassium, magnesium plays a critical role in cardiac repolarization. Magnesium deficiency can exacerbate QT prolongation caused by ranolazine and increase arrhythmia susceptibility. Conversely, maintaining adequate magnesium levels may be cardioprotective in patients on ranolazine. Electrolyte status should be assessed before and during ranolazine therapy.
Evidence
Evidence level: moderate.
Reported safety data
The FDA’s adverse event reporting system (FAERS) has received 10,793 reports mentioning Ranolazine. This reflects reported cases involving the medication in general — not confirmed causation, and not specific to the Ranolazine + 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 Ranolazine interactions →
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Educational only — not medical advice.
Always confirm with your doctor or pharmacist.