Drug interactions
Guanfacine + Nadolol
Severity: Moderate
Guanfacine and Nadolol: 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
Both drugs lower heart rate and blood pressure, so additive bradycardia and hypotension may occur. Stopping guanfacine while on a beta blocker can cause rebound hypertension that may be exaggerated by unopposed alpha activity.
What this interaction means in plain words
Guanfacine and Nadolol 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 belongs to Cardiovascular; Nadolol belongs to Cardiovascular.
Why it happens
Additive sympatholytic effects, with rebound sympathetic overactivity on guanfacine withdrawal worsened by beta blockade.
What to do
Monitor heart rate and blood pressure. When stopping guanfacine, taper it gradually and withdraw the beta blocker first if both are being stopped.
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 Nadolol
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 Guanfacine with Nadolol?
MediHelp rates the interaction as moderate. Guanfacine and Nadolol 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. Both drugs lower heart rate and blood pressure, so additive bradycardia and hypotension may occur. Stopping guanfacine while on a beta blocker can cause rebound hypertension that may be exaggerated by unopposed alpha activity.
How serious is the interaction between Guanfacine and Nadolol?
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 withdraw the beta blocker first if both are being stopped.
What other medicines interact with Nadolol?
MediHelp also lists interactions of Nadolol with, for example, Acebutolol, Adrenaline-articaine, Amifostine. The full list is on the Nadolol page.
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