Drug interactions
Atenolol-chlorthalidone + Guanfacine
Severity: Moderate
Atenolol-chlorthalidone and Guanfacine: 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
Guanfacine and atenolol both lower blood pressure and heart rate, so bradycardia and hypotension may be additive. If guanfacine is stopped abruptly while a beta-blocker continues, rebound hypertension can be exaggerated.
What this interaction means in plain words
Atenolol-chlorthalidone and Guanfacine 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; Guanfacine belongs to Cardiovascular.
Why it happens
Additive sympatholytic effects, with unopposed alpha stimulation during withdrawal of central alpha-2 agonist.
What to do
Monitor heart rate and blood pressure. When stopping guanfacine, taper it gradually and consider withdrawing the beta-blocker first.
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 Guanfacine, 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
Other interactions of Guanfacine
- Clonidine + Guanfacine Major
- Guanfacine + Lofexidine Major
- Aldesleukin + Guanfacine Moderate
- Amiodarone + Guanfacine Moderate
- Amisulpride + Guanfacine Moderate
- Amitriptyline + Guanfacine Moderate
Frequently asked questions
Can I take Atenolol-chlorthalidone with Guanfacine?
MediHelp rates the interaction as moderate. Atenolol-chlorthalidone and Guanfacine 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. Guanfacine and atenolol both lower blood pressure and heart rate, so bradycardia and hypotension may be additive. If guanfacine is stopped abruptly while a beta-blocker continues, rebound hypertension can be exaggerated.
How serious is the interaction between Atenolol-chlorthalidone and Guanfacine?
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 and blood pressure. When stopping guanfacine, taper it gradually and consider withdrawing the beta-blocker first.
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.
