Drug interactions
atenolol + doxazosin
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.
Overview
Additive antihypertensive effects with increased risk of orthostatic hypotension and first-dose syncope when doxazosin is initiated.
Mechanism of action
Pharmacodynamic: Reduced cardiac output from beta-blockade plus peripheral alpha-1 vasodilation.
Clinical management
Begin doxazosin at 1 mg at bedtime; titrate slowly; monitor orthostatic vitals; counsel on rising slowly and holding doses if symptomatic.
Drug reference
References
- Cardura (doxazosin) Prescribing Information — Warnings and Precautions: Syncope and Postural Hypotension — FDA Label
- Alpha-1 adrenergic antagonists for hypertension — UpToDate
Frequently asked questions
Can I take atenolol with doxazosin?
The interaction is rated: Moderate. Additive antihypertensive effects with increased risk of orthostatic hypotension and first-dose syncope when doxazosin is initiated.
How serious is the interaction between atenolol and doxazosin?
The interaction is rated: Moderate. Evidence level: High.
How is the interaction between atenolol and doxazosin managed?
Begin doxazosin at 1 mg at bedtime; titrate slowly; monitor orthostatic vitals; counsel on rising slowly and holding doses if symptomatic.
Why do atenolol and doxazosin interact?
Pharmacodynamic: Reduced cardiac output from beta-blockade plus peripheral alpha-1 vasodilation.
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