Drug interactions
Atenolol-chlorthalidone + Bretylium
Severity: Moderate
Atenolol-chlorthalidone and Bretylium: 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
Bretylium causes hypotension through adrenergic neuron blockade, and combining it with a beta-blocker and a diuretic can increase the risk of low blood pressure. Initial adrenergic release followed by blockade may also complicate hemodynamics.
What this interaction means in plain words
Atenolol-chlorthalidone and Bretylium 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 hypotensive effects from adrenergic neuron blockade by bretylium, beta blockade by atenolol and volume depletion from chlorthalidone.
What to do
Monitor blood pressure and heart rate closely when bretylium is used, and correct volume depletion beforehand. Reduce or hold the antihypertensive doses if hypotension develops.
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
Frequently asked questions
Can I take Atenolol-chlorthalidone with Bretylium?
MediHelp rates the interaction as moderate. Atenolol-chlorthalidone and Bretylium 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. Bretylium causes hypotension through adrenergic neuron blockade, and combining it with a beta-blocker and a diuretic can increase the risk of low blood pressure. Initial adrenergic release followed by blockade may also complicate hemodynamics.
How serious is the interaction between Atenolol-chlorthalidone and Bretylium?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Monitor blood pressure and heart rate closely when bretylium is used, and correct volume depletion beforehand. Reduce or hold the antihypertensive doses if hypotension develops.
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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