Drug interactions
Atenolol-chlorthalidone + Ephedrine
Severity: Moderate
Atenolol-chlorthalidone and Ephedrine: 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 can antagonize the cardiac and bronchodilator effects of ephedrine, and unopposed alpha stimulation may cause hypertension with reflex bradycardia. Ephedrine may also oppose the antihypertensive effect and contribute to potassium shifts with chlorthalidone.
What this interaction means in plain words
Atenolol-chlorthalidone and Ephedrine 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; Ephedrine belongs to Cardiovascular.
Why it happens
Pharmacodynamic antagonism at beta-adrenoceptors with unopposed alpha-mediated vasoconstriction, plus additive potassium lowering.
What to do
Monitor blood pressure, heart rate and potassium when ephedrine is used; consider an alternative decongestant or vasopressor if the response is inadequate.
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 Ephedrine
- Ephedrine + Isocarboxazid Contraindicated
- Ephedrine + Phenelzine Contraindicated
- Ephedrine + Procarbazine Contraindicated
- Ephedrine + Rasagiline Contraindicated
- Ephedrine + Selegiline Contraindicated
- Ephedrine + Tranylcypromine Contraindicated
Frequently asked questions
Can I take Atenolol-chlorthalidone with Ephedrine?
MediHelp rates the interaction as moderate. Atenolol-chlorthalidone and Ephedrine 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 can antagonize the cardiac and bronchodilator effects of ephedrine, and unopposed alpha stimulation may cause hypertension with reflex bradycardia. Ephedrine may also oppose the antihypertensive effect and contribute to potassium shifts with chlorthalidone.
How serious is the interaction between Atenolol-chlorthalidone and Ephedrine?
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 blood pressure, heart rate and potassium when ephedrine is used; consider an alternative decongestant or vasopressor if the response is inadequate.
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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