Drug interactions
Metolazone + Pirbuterol
Severity: Moderate
Metolazone 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
Both drugs can lower serum potassium, so combining them may cause clinically important hypokalemia. This raises the risk of muscle weakness and cardiac arrhythmias, particularly in patients with cardiac disease or taking digoxin or QT-prolonging drugs.
What this interaction means in plain words
Metolazone 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 agonist-driven intracellular potassium shift plus thiazide-like diuretic renal potassium loss.
What to do
Check serum potassium and magnesium at baseline and periodically, and replace as needed. Take extra care with high or frequent beta-agonist dosing.
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 Metolazone
Frequently asked questions
Can I take Metolazone with Pirbuterol?
MediHelp rates the interaction as moderate. Metolazone 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. Both drugs can lower serum potassium, so combining them may cause clinically important hypokalemia. This raises the risk of muscle weakness and cardiac arrhythmias, particularly in patients with cardiac disease or taking digoxin or QT-prolonging drugs.
How serious is the interaction between Metolazone 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: Check serum potassium and magnesium at baseline and periodically, and replace as needed. Take extra care with high or frequent beta-agonist dosing.
What other medicines interact with Metolazone?
MediHelp also lists interactions of Metolazone with, for example, Amifostine, Amlodipine-hydrochlorothiazide-valsartan, Amlodipine-olmesartan-hydrochlorothiazide. The full list is on the Metolazone page.
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