Drug interactions
Bendroflumethiazide + Pirbuterol
Severity: Moderate
Bendroflumethiazide and Pirbuterol: 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
Beta-2 agonists such as pirbuterol can lower serum potassium, and thiazide diuretics also cause potassium loss through increased renal excretion. Together they can produce additive hypokalemia, which may predispose to arrhythmias, particularly in patients with heart disease or on other QT-prolonging drugs.
What this interaction means in plain words
Bendroflumethiazide and Pirbuterol 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 hypokalemia: beta-2 stimulation shifts potassium into cells while thiazides increase renal potassium loss.
What to do
Monitor serum potassium and magnesium, especially when starting therapy or using high doses of pirbuterol. Replace potassium as needed and consider a potassium-sparing strategy in at-risk patients.
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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Frequently asked questions
Can I take Bendroflumethiazide with Pirbuterol?
MediHelp rates the interaction as moderate. Bendroflumethiazide and Pirbuterol 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. Beta-2 agonists such as pirbuterol can lower serum potassium, and thiazide diuretics also cause potassium loss through increased renal excretion. Together they can produce additive hypokalemia, which may predispose to arrhythmias, particularly in patients with heart disease or on other QT-prolonging drugs.
How serious is the interaction between Bendroflumethiazide and Pirbuterol?
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 serum potassium and magnesium, especially when starting therapy or using high doses of pirbuterol. Replace potassium as needed and consider a potassium-sparing strategy in at-risk patients.
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