Drug interactions
Calcium acetate + Chlorthalidone
Severity: Moderate
Calcium acetate 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 reduce urinary calcium excretion, so calcium salts given with chlorthalidone can raise serum calcium more than expected. Hypercalcemia is most likely with high calcium doses, renal impairment or concurrent vitamin D.
What this interaction means in plain words
Calcium acetate 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.
Calcium acetate belongs to Genitourinary; Chlorthalidone belongs to Cardiovascular.
Why it happens
Chlorthalidone enhances distal tubular calcium reabsorption, lowering renal calcium clearance and adding to calcium load from the supplement or binder.
What to do
Monitor serum calcium periodically, especially in renal impairment or with vitamin D therapy. Reduce the calcium 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?
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Other interactions of Chlorthalidone
Other interactions of Calcium acetate
Frequently asked questions
Can I take Calcium acetate with Chlorthalidone?
MediHelp rates the interaction as moderate. Calcium acetate 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 reduce urinary calcium excretion, so calcium salts given with chlorthalidone can raise serum calcium more than expected. Hypercalcemia is most likely with high calcium doses, renal impairment or concurrent vitamin D.
How serious is the interaction between Calcium acetate 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 in renal impairment or with vitamin D therapy. Reduce the calcium 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.
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