Is Calcium Safe with Nifedipine?
Free · No account · based on published sources including NIH ODS, FDA drug labels, and peer-reviewed literature
Standard dietary calcium intake is acceptable. Avoid very high supplemental calcium doses (>1500 mg/day) without consulting your prescriber, as this may slightly reduce nifedipine's blood pressure-lowering effectiveness.
Why this interaction occurs
Supraphysiologic calcium levels from high-dose supplementation may partially overcome the calcium channel blocking effect of nifedipine by increasing calcium availability at the channel level. Clinical significance is generally low at typical supplement doses but warrants monitoring in patients with difficult-to-control hypertension.
Evidence
Evidence level: limited.
Reported safety data
The FDA’s adverse event reporting system (FAERS) has received 43,783 reports mentioning Nifedipine. This reflects reported cases involving the medication in general — not confirmed causation, and not specific to the Nifedipine + 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 Calcium interactions → · All Nifedipine interactions →
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Educational only — not medical advice.
Always confirm with your doctor or pharmacist.