Drug interactions
Betaxolol + Prazosin
Severity: Moderate
Betaxolol 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
Prazosin can cause first-dose and orthostatic hypotension. Betaxolol adds antihypertensive effect and may blunt reflex tachycardia, increasing the risk of dizziness and syncope.
What this interaction means in plain words
Betaxolol 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.
Betaxolol belongs to Cardiovascular; Prazosin belongs to Genitourinary.
Why it happens
Additive vasodilatory and blood pressure lowering effects from alpha-1 blockade and beta-blockade.
What to do
Start prazosin at a low bedtime dose in patients taking betaxolol and titrate gradually. Check standing blood pressure and counsel on orthostatic symptoms.
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 Betaxolol
- Acebutolol + Betaxolol Major
- Aldesleukin + Betaxolol Major
- Amifostine + Betaxolol Major
- Amiodarone + Betaxolol Major
- Atenolol-chlorthalidone + Betaxolol Major
- Atenolol + Betaxolol Major
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 Betaxolol with Prazosin?
MediHelp rates the interaction as moderate. Betaxolol 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. Prazosin can cause first-dose and orthostatic hypotension. Betaxolol adds antihypertensive effect and may blunt reflex tachycardia, increasing the risk of dizziness and syncope.
How serious is the interaction between Betaxolol 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: Start prazosin at a low bedtime dose in patients taking betaxolol and titrate gradually. Check standing blood pressure and counsel on orthostatic symptoms.
What other medicines interact with Betaxolol?
MediHelp also lists interactions of Betaxolol with, for example, Acebutolol, Aldesleukin, Amifostine. The full list is on the Betaxolol page.
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