Drug interactions
Atenolol-chlorthalidone + Doxazosin
Severity: Moderate
Atenolol-chlorthalidone and Doxazosin: 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
Doxazosin lowers blood pressure through alpha-1 blockade, and adding atenolol and chlorthalidone produces additive hypotension. Orthostatic hypotension and syncope are most likely after the first dose or a dose increase.
What this interaction means in plain words
Atenolol-chlorthalidone and Doxazosin 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-chlorthalidone belongs to Cardiovascular; Doxazosin belongs to Genitourinary.
Why it happens
Additive hypotensive effects from alpha-1 blockade, beta-blockade and diuresis.
What to do
Start doxazosin at a low dose, titrate gradually, and monitor supine and standing blood pressure.
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-chlorthalidone
Other interactions of Doxazosin
- Alfuzosin + Doxazosin Major
- Amifostine + Doxazosin Major
- Avanafil + Doxazosin Major
- Doxazosin + Dutasteride-tamsulosin Major
- Doxazosin + Phentolamine Major
- Doxazosin + Prazosin Major
Frequently asked questions
Can I take Atenolol-chlorthalidone with Doxazosin?
MediHelp rates the interaction as moderate. Atenolol-chlorthalidone and Doxazosin 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. Doxazosin lowers blood pressure through alpha-1 blockade, and adding atenolol and chlorthalidone produces additive hypotension. Orthostatic hypotension and syncope are most likely after the first dose or a dose increase.
How serious is the interaction between Atenolol-chlorthalidone and Doxazosin?
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 doxazosin at a low dose, titrate gradually, and monitor supine and standing blood pressure.
What other medicines interact with Atenolol-chlorthalidone?
MediHelp also lists interactions of Atenolol-chlorthalidone with, for example, Acebutolol, Aldesleukin, Amiodarone. The full list is on the Atenolol-chlorthalidone page.
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