Hydrochlorothiazide and Vitamin D: Drug Interaction Guide
Quick answer: Hydrochlorothiazide and Vitamin D have a minor interaction — typically manageable with awareness.
How Hydrochlorothiazide interacts with Vitamin D
Hydrochlorothiazide reduces renal calcium excretion, while vitamin D increases intestinal calcium absorption, producing a small additive risk of hypercalcaemia.
What you should do
Usual supplementation is generally acceptable. Monitor serum calcium when high vitamin D doses are used or when the patient has renal impairment, hyperparathyroidism, or other hypercalcaemia risks.
Key facts
Severity
Minor — typically manageable
Mechanism
Hydrochlorothiazide reduces renal calcium excretion, while vitamin D increases intestinal calcium absorption, producing ...
Action
Usual supplementation is generally acceptable. Monitor serum calcium when high vitamin D doses are used or when the pati...
Frequently asked questions
Can I take Hydrochlorothiazide and Vitamin D together?
Usually yes, with awareness. Usual supplementation is generally acceptable. Monitor serum calcium when high vitamin D doses are used or when the patient has renal impairment, hyperparathyroidism, or other hypercalcaemia risks.
What is the severity of this interaction?
The interaction between Hydrochlorothiazide and Vitamin D is classified as Minor — typically manageable. Hydrochlorothiazide reduces renal calcium excretion, while vitamin D increases intestinal calcium absorption, producing a small additive risk of hypercalcaemia.
What should I do if I'm prescribed both?
Usual supplementation is generally acceptable. Monitor serum calcium when high vitamin D doses are used or when the patient has renal impairment, hyperparathyroidism, or other hypercalcaemia risks. Always consult your prescribing clinician — do not stop or change medications without medical guidance.
Last reviewed: by iMedic Medical Editorial Team. Our editorial process.