Drug interactions
Calcitriol + Calcium
Severity: Moderate
Calcitriol and Calcium: moderate interaction.
Last updated
For healthcare professionals — reference only. This page is a brief summary, not medical advice and not a substitute for official labeling or clinical judgement. Always verify before prescribing or dispensing.
Summary
Calcitriol raises serum calcium by increasing intestinal absorption and bone resorption, so adding calcium supplements can promote hypercalcemia. Systemic calcitriol carries the greater risk. Topical use has limited absorption, but excessive amounts can still raise calcium.
What this interaction means in plain words
Calcitriol and Calcium can affect each other. The combination is often manageable, but it may need a change of dose, a change of timing, or extra checks while both are taken.
Calcitriol belongs to Musculoskeletal; Calcium belongs to Gastrointestinal Tract.
Why it happens
Additive effects on serum calcium through vitamin D-mediated enhancement of intestinal calcium absorption.
What to do
Monitor serum calcium and phosphate periodically, and reduce the calcium supplement or calcitriol dose if hypercalcemia develops. Limit topical calcitriol to the recommended area and amount.
What to ask your pharmacist
- Should I take them at different times of day?
- Does the dose of either medicine need to change?
- Is there anything I should avoid, such as alcohol or certain foods, while on both?
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Other interactions of Calcium
- Calcium + Ceftriaxone Contraindicated
- Acalabrutinib + Calcium Moderate
- Alendronate + Calcium Moderate
- Atazanavir + Calcium Moderate
- Baloxavir marboxil + Calcium Moderate
- Bendroflumethiazide + Calcium Moderate
Other interactions of Calcitriol
- Amlodipine-hydrochlorothiazide-valsartan + Calcitriol Moderate
- Amlodipine-olmesartan-hydrochlorothiazide + Calcitriol Moderate
- Amobarbital + Calcitriol Moderate
- Apalutamide + Calcitriol Moderate
- Atazanavir + Calcitriol Moderate
- Atenolol-chlorthalidone + Calcitriol Moderate
Frequently asked questions
Can I take Calcitriol with Calcium?
MediHelp rates the interaction as moderate. Calcitriol and Calcium can affect each other. The combination is often manageable, but it may need a change of dose, a change of timing, or extra checks while both are taken. Calcitriol raises serum calcium by increasing intestinal absorption and bone resorption, so adding calcium supplements can promote hypercalcemia. Systemic calcitriol carries the greater risk. Topical use has limited absorption, but excessive amounts can still raise calcium.
How serious is the interaction between Calcitriol and Calcium?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Monitor serum calcium and phosphate periodically, and reduce the calcium supplement or calcitriol dose if hypercalcemia develops. Limit topical calcitriol to the recommended area and amount.
What other medicines interact with Calcium?
MediHelp also lists interactions of Calcium with, for example, Ceftriaxone, Acalabrutinib, Alendronate. The full list is on the Calcium page.
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