Drug interactions
Ethanol + Prazosin
Severity: Moderate
Ethanol and Prazosin: 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
Alcohol causes vasodilation and can lower blood pressure, which may add to the vasodilatory effect of prazosin. This can result in dizziness, lightheadedness or fainting, especially after standing up.
What this interaction means in plain words
Ethanol and Prazosin 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.
Why it happens
Additive vasodilation and hypotension from alcohol and alpha-1 adrenergic blockade.
What to do
Advise patients to limit alcohol and to stand slowly, especially after the first doses or dose increases. Reassess blood pressure if symptoms occur.
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 Prazosin
- Alfuzosin + Prazosin Major
- Amifostine + Prazosin Major
- Avanafil + Prazosin Major
- Doxazosin + Prazosin Major
- Dutasteride-tamsulosin + Prazosin Major
- Phenoxybenzamine + Prazosin Major
Frequently asked questions
Can I take Ethanol with Prazosin?
MediHelp rates the interaction as moderate. Ethanol and Prazosin 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. Alcohol causes vasodilation and can lower blood pressure, which may add to the vasodilatory effect of prazosin. This can result in dizziness, lightheadedness or fainting, especially after standing up.
How serious is the interaction between Ethanol and Prazosin?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Advise patients to limit alcohol and to stand slowly, especially after the first doses or dose increases. Reassess blood pressure if symptoms occur.
What other medicines interact with Prazosin?
MediHelp also lists interactions of Prazosin with, for example, Alfuzosin, Amifostine, Avanafil. The full list is on the Prazosin page.
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