Drug interactions
Atenolol-chlorthalidone + Calcium carbonate
Severity: Minor
Atenolol-chlorthalidone and Calcium carbonate: minor 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
Calcium salts can lower oral atenolol absorption, which may weaken its heart rate and blood pressure effects. Thiazide-like diuretics reduce urinary calcium excretion, so high calcium intake may rarely cause hypercalcemia.
What this interaction means in plain words
Atenolol-chlorthalidone and Calcium carbonate have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised.
Atenolol-chlorthalidone belongs to Cardiovascular; Calcium carbonate belongs to Gastrointestinal Tract.
Why it happens
Calcium reduces gastrointestinal absorption of atenolol, and chlorthalidone decreases renal calcium excretion.
What to do
Separate atenolol and calcium carbonate by at least 2 hours, and check serum calcium if high doses are used long term.
What to ask your pharmacist
- Is there anything I should notice while taking both?
- Do I need to tell my doctor at the next visit?
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Other interactions of Atenolol-chlorthalidone
Other interactions of Calcium carbonate
Frequently asked questions
Can I take Atenolol-chlorthalidone with Calcium carbonate?
MediHelp rates the interaction as minor. Atenolol-chlorthalidone and Calcium carbonate have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised. Calcium salts can lower oral atenolol absorption, which may weaken its heart rate and blood pressure effects. Thiazide-like diuretics reduce urinary calcium excretion, so high calcium intake may rarely cause hypercalcemia.
How serious is the interaction between Atenolol-chlorthalidone and Calcium carbonate?
MediHelp rates it minor, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Separate atenolol and calcium carbonate by at least 2 hours, and check serum calcium if high doses are used long term.
What other medicines interact with Atenolol-chlorthalidone?
MediHelp also lists interactions of Atenolol-chlorthalidone with, for example, Acebutolol, Aldesleukin, Amiodarone. The full list is on the Atenolol-chlorthalidone page.
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