Drug interactions
Doxazosin + Dutasteride-tamsulosin
Severity: Major
Doxazosin and Dutasteride-tamsulosin: major 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
Tamsulosin and doxazosin are both alpha-1 blockers, so combined use adds blood-pressure-lowering effects without clear benefit. This increases the risk of orthostatic hypotension and syncope.
What this interaction means in plain words
Doxazosin and Dutasteride-tamsulosin can interact in a way that may be serious. Using them together is sometimes necessary, but it needs a deliberate decision by the prescriber, a plan for monitoring, and clear advice on the warning signs to watch for.
Doxazosin belongs to Genitourinary; Dutasteride-tamsulosin belongs to Genitourinary.
Why it happens
Additive alpha-1 adrenergic blockade causing vasodilation.
What to do
Avoid duplicate alpha-blocker therapy and use a single agent. Monitor standing blood pressure if overlap is unavoidable.
What to ask your pharmacist
- Does the benefit of taking both outweigh the risk in my case?
- Do I need any blood test, ECG or other check while on both?
- What early warning signs should I watch for, and what should I do if they appear?
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Other interactions of Dutasteride-tamsulosin
Other interactions of Doxazosin
- Alfuzosin + Doxazosin Major
- Amifostine + Doxazosin Major
- Avanafil + Doxazosin Major
- Doxazosin + Phentolamine Major
- Doxazosin + Prazosin Major
- Doxazosin + Sildenafil Major
Frequently asked questions
Can I take Doxazosin with Dutasteride-tamsulosin?
MediHelp rates the interaction as major. Doxazosin and Dutasteride-tamsulosin can interact in a way that may be serious. Using them together is sometimes necessary, but it needs a deliberate decision by the prescriber, a plan for monitoring, and clear advice on the warning signs to watch for. Tamsulosin and doxazosin are both alpha-1 blockers, so combined use adds blood-pressure-lowering effects without clear benefit. This increases the risk of orthostatic hypotension and syncope.
How serious is the interaction between Doxazosin and Dutasteride-tamsulosin?
MediHelp rates it major, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Avoid duplicate alpha-blocker therapy and use a single agent. Monitor standing blood pressure if overlap is unavoidable.
What other medicines interact with Dutasteride-tamsulosin?
MediHelp also lists interactions of Dutasteride-tamsulosin with, for example, Alfuzosin, Amifostine, Atazanavir. The full list is on the Dutasteride-tamsulosin page.
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