Drug interactions
Calcitriol + Chlorthalidone
Severity: Moderate
Calcitriol and Chlorthalidone: 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
Thiazide-type diuretics lower urinary calcium excretion, while calcitriol raises calcium absorption from the gut and bone resorption. Together they can cause hypercalcemia, especially in patients with renal impairment or hypoparathyroidism. Topical calcitriol has low systemic exposure, so the risk is mainly with oral or large-area topical use.
What this interaction means in plain words
Calcitriol and Chlorthalidone 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; Chlorthalidone belongs to Cardiovascular.
Why it happens
Additive effects on serum calcium: reduced renal calcium excretion from chlorthalidone plus increased calcium absorption from calcitriol.
What to do
Monitor serum calcium periodically, especially after dose changes of either drug. Reduce the calcitriol dose or review the diuretic if hypercalcemia develops.
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?
Pro+ members
Unlock the full page
Create an account and start a Pro+ trial to unlock the full management advice for Calcitriol and Chlorthalidone, the additional notes, the evidence detail and the whole-prescription interaction checker.
- Full clinical management advice
- Additional notes
- Evidence detail
- Interaction checker for a whole prescription
Try Pro+ free for 14 days on the web. No card needed.
Other interactions of Chlorthalidone
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 Chlorthalidone?
MediHelp rates the interaction as moderate. Calcitriol and Chlorthalidone 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. Thiazide-type diuretics lower urinary calcium excretion, while calcitriol raises calcium absorption from the gut and bone resorption. Together they can cause hypercalcemia, especially in patients with renal impairment or hypoparathyroidism. Topical calcitriol has low systemic exposure, so the risk is mainly with oral or large-area topical use.
How serious is the interaction between Calcitriol and Chlorthalidone?
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 periodically, especially after dose changes of either drug. Reduce the calcitriol dose or review the diuretic if hypercalcemia develops.
What other medicines interact with Chlorthalidone?
MediHelp also lists interactions of Chlorthalidone with, for example, Amifostine, Atenolol-chlorthalidone, Candesartan-hydrochlorothiazide. The full list is on the Chlorthalidone page.
Full monographs, dosing and an interaction checker in the MediHelp app
Open the complete reference, check multi-drug interactions and use dosing tools in the MediHelp app.
