Drug interactions
Atenolol + Prazosin
Severity: Moderate
Atenolol 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
Both drugs lower blood pressure, and the combination can intensify first-dose hypotension with prazosin. Dizziness and syncope are most likely at initiation or after dose increases.
What this interaction means in plain words
Atenolol 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.
Atenolol belongs to Cardiovascular; Prazosin belongs to Genitourinary.
Why it happens
Additive vasodilation from alpha-1 blockade plus beta blockade limiting compensatory tachycardia.
What to do
Begin prazosin at a low dose at bedtime and increase gradually. Check orthostatic blood pressure after dose changes.
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 Atenolol
- Amifostine + Atenolol Major
- Amiodarone + Atenolol Major
- Atenolol + Atenolol-chlorthalidone Major
- Atenolol + Betaxolol Major
- Atenolol + Bisoprolol Major
- Atenolol + Carvedilol 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 Atenolol with Prazosin?
MediHelp rates the interaction as moderate. Atenolol 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. Both drugs lower blood pressure, and the combination can intensify first-dose hypotension with prazosin. Dizziness and syncope are most likely at initiation or after dose increases.
How serious is the interaction between Atenolol 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: Begin prazosin at a low dose at bedtime and increase gradually. Check orthostatic blood pressure after dose changes.
What other medicines interact with Atenolol?
MediHelp also lists interactions of Atenolol with, for example, Amifostine, Amiodarone, Atenolol-chlorthalidone. The full list is on the Atenolol page.
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