Is Vitamin D Safe with Prednisone?
Free · No account · based on published sources including NIH ODS, FDA drug labels, and peer-reviewed literature
Take vitamin D supplementation (800-2000 IU/day) alongside calcium as recommended by your doctor. Have serum 25-OH vitamin D levels monitored regularly during chronic prednisone therapy.
Why this interaction occurs
Prednisone impairs vitamin D metabolism by reducing the conversion of calcidiol to calcitriol and downregulating vitamin D receptor expression, reducing calcium absorption. Combined calcium and vitamin D supplementation is guideline-recommended for patients on chronic corticosteroid therapy to prevent osteoporosis.
Evidence
Evidence level: strong.
Reported safety data
The FDA’s adverse event reporting system (FAERS) has received 532,790 reports mentioning Prednisone. This reflects reported cases involving the medication in general — not confirmed causation, and not specific to the Prednisone + 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 Vitamin D interactions → · All Prednisone interactions →
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Educational only — not medical advice.
Always confirm with your doctor or pharmacist.