Drug interactions
Atenolol-chlorthalidone + Isoproterenol
Severity: Moderate
Atenolol-chlorthalidone and Isoproterenol: 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
Atenolol is a beta-blocker and blunts the bronchodilator, chronotropic and inotropic effects of isoproterenol, a nonselective beta agonist. Isoproterenol can also lower potassium, and this may add to the potassium loss caused by chlorthalidone and increase arrhythmia risk.
What this interaction means in plain words
Atenolol-chlorthalidone and Isoproterenol 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; Isoproterenol belongs to Respiratory.
Why it happens
Competitive beta-adrenoceptor antagonism by atenolol opposes isoproterenol, and beta-2 stimulation plus thiazide-type diuresis additively lower serum potassium.
What to do
Monitor heart rate, blood pressure and clinical response to isoproterenol, and expect higher doses may be needed for effect. Check serum potassium and correct hypokalemia.
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 Isoproterenol
Frequently asked questions
Can I take Atenolol-chlorthalidone with Isoproterenol?
MediHelp rates the interaction as moderate. Atenolol-chlorthalidone and Isoproterenol 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 is a beta-blocker and blunts the bronchodilator, chronotropic and inotropic effects of isoproterenol, a nonselective beta agonist. Isoproterenol can also lower potassium, and this may add to the potassium loss caused by chlorthalidone and increase arrhythmia risk.
How serious is the interaction between Atenolol-chlorthalidone and Isoproterenol?
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 heart rate, blood pressure and clinical response to isoproterenol, and expect higher doses may be needed for effect. Check serum potassium and correct hypokalemia.
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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