Drug interactions
Atenolol-chlorthalidone + Calcium acetate
Severity: Moderate
Atenolol-chlorthalidone and Calcium acetate: 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
Calcium salts can reduce atenolol absorption in the gut, which may lessen its effect on heart rate and blood pressure. Chlorthalidone also reduces urinary calcium excretion, so calcium load can add to hypercalcaemia risk.
What this interaction means in plain words
Atenolol-chlorthalidone and Calcium acetate 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.
Atenolol-chlorthalidone belongs to Cardiovascular; Calcium acetate belongs to Genitourinary.
Why it happens
Calcium may bind atenolol or otherwise reduce its gastrointestinal absorption, and thiazides reduce renal calcium excretion.
What to do
Separate atenolol and calcium acetate by at least 2 hours. Monitor serum calcium and blood pressure.
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 Atenolol-chlorthalidone
Other interactions of Calcium acetate
Frequently asked questions
Can I take Atenolol-chlorthalidone with Calcium acetate?
MediHelp rates the interaction as moderate. Atenolol-chlorthalidone and Calcium acetate 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 salts can reduce atenolol absorption in the gut, which may lessen its effect on heart rate and blood pressure. Chlorthalidone also reduces urinary calcium excretion, so calcium load can add to hypercalcaemia risk.
How serious is the interaction between Atenolol-chlorthalidone and Calcium acetate?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Separate atenolol and calcium acetate by at least 2 hours. Monitor serum calcium and blood pressure.
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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