Drug interactions
bisoprolol + 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 increase risk of postural hypotension and syncope, especially after the first doxazosin dose or dose escalation.
Mechanism of action
Pharmacodynamic: peripheral alpha-1 blockade (vasodilation) plus beta-1 blockade (reduced cardiac output) → lower BP.
Clinical management
Start doxazosin at 1 mg HS; titrate cautiously. Monitor sitting/standing BP and HR; adjust doses if symptomatic hypotension occurs.
Drug reference
References
- Cardura (doxazosin) Prescribing Information — FDA Label
- Zebeta (bisoprolol) Prescribing Information — FDA Label
- Doxazosin: Drug Interactions — Lexicomp
Frequently asked questions
Can I take bisoprolol with doxazosin?
The interaction is rated: Moderate. Additive antihypertensive effects increase risk of postural hypotension and syncope, especially after the first doxazosin dose or dose escalation.
How serious is the interaction between bisoprolol and doxazosin?
The interaction is rated: Moderate. Evidence level: High.
How is the interaction between bisoprolol and doxazosin managed?
Start doxazosin at 1 mg HS; titrate cautiously. Monitor sitting/standing BP and HR; adjust doses if symptomatic hypotension occurs.
Why do bisoprolol and doxazosin interact?
Pharmacodynamic: peripheral alpha-1 blockade (vasodilation) plus beta-1 blockade (reduced cardiac output) → lower BP.
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