Drug interactions
Chlorthalidone + Ergocalciferol
Severity: Moderate
Chlorthalidone and Ergocalciferol: 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 reduce urinary calcium excretion, and with vitamin D this may lead to hypercalcemia. The risk is greater with high vitamin D doses or in hypoparathyroidism and renal impairment.
What this interaction means in plain words
Chlorthalidone and Ergocalciferol 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.
Chlorthalidone belongs to Cardiovascular; Ergocalciferol belongs to Musculoskeletal.
Why it happens
Chlorthalidone decreases renal calcium excretion, adding to the increased calcium absorption caused by vitamin D.
What to do
Monitor serum calcium, especially after starting or changing doses. Reduce vitamin D dose 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?
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Other interactions of Ergocalciferol
- Aluminum hydroxide + Ergocalciferol Moderate
- Calcium acetate + Ergocalciferol Moderate
- Calcium carbonate + Ergocalciferol Moderate
- Calcium chloride + Ergocalciferol Moderate
- Calcium citrate + Ergocalciferol Moderate
- Calcium gluconate + Ergocalciferol Moderate
Other interactions of Chlorthalidone
Frequently asked questions
Can I take Chlorthalidone with Ergocalciferol?
MediHelp rates the interaction as moderate. Chlorthalidone and Ergocalciferol 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 reduce urinary calcium excretion, and with vitamin D this may lead to hypercalcemia. The risk is greater with high vitamin D doses or in hypoparathyroidism and renal impairment.
How serious is the interaction between Chlorthalidone and Ergocalciferol?
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, especially after starting or changing doses. Reduce vitamin D dose if hypercalcemia develops.
What other medicines interact with Ergocalciferol?
MediHelp also lists interactions of Ergocalciferol with, for example, Aluminum hydroxide, Calcium acetate, Calcium carbonate. The full list is on the Ergocalciferol page.
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