Drug interactions
Atenolol-chlorthalidone + Isradipine
Severity: Moderate
Atenolol-chlorthalidone and Isradipine: 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
Combining a beta-blocker, a thiazide-like diuretic and a dihydropyridine calcium channel blocker produces additive blood pressure lowering. This is often used deliberately but can cause hypotension, dizziness or syncope, especially at initiation or in older patients. Isradipine's reflex tachycardia is blunted by atenolol.
What this interaction means in plain words
Atenolol-chlorthalidone and Isradipine 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.
Why it happens
Additive pharmacodynamic hypotensive effects through different mechanisms: beta-blockade, diuresis and vasodilation.
What to do
Monitor blood pressure and heart rate when starting or adjusting doses and counsel patients about orthostatic symptoms. Reduce the dose of one agent if hypotension occurs.
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?
Pro+ members
Unlock the full page
Create an account and start a Pro+ trial to unlock the full management advice for Atenolol-chlorthalidone and Isradipine, the additional notes, the evidence detail and the whole-prescription interaction checker.
- Full clinical management advice
- Additional notes
- Evidence detail
- Interaction checker for a whole prescription
Try Pro+ free for 7 days on the web. No card needed.
Other interactions of Atenolol-chlorthalidone
Frequently asked questions
Can I take Atenolol-chlorthalidone with Isradipine?
MediHelp rates the interaction as moderate. Atenolol-chlorthalidone and Isradipine 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. Combining a beta-blocker, a thiazide-like diuretic and a dihydropyridine calcium channel blocker produces additive blood pressure lowering. This is often used deliberately but can cause hypotension, dizziness or syncope, especially at initiation or in older patients. Isradipine's reflex tachycardia is blunted by atenolol.
How serious is the interaction between Atenolol-chlorthalidone and Isradipine?
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 and heart rate when starting or adjusting doses and counsel patients about orthostatic symptoms. Reduce the dose of one agent if hypotension occurs.
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.
Full monographs, dosing and an interaction checker in the MediHelp app
Open the complete reference, check multi-drug interactions and use dosing tools in the MediHelp app.
