Drug interactions
Arformoterol + Metolazone
Severity: Moderate
Arformoterol and Metolazone: 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 serum potassium, so combined use can cause additive hypokalemia. Arformoterol may also cause ECG changes, so hypokalemia may heighten arrhythmia risk.
What this interaction means in plain words
Arformoterol and Metolazone 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.
Arformoterol belongs to Respiratory; Metolazone belongs to Cardiovascular.
Why it happens
Beta-2 agonist-induced intracellular potassium shift adds to metolazone renal potassium wasting.
What to do
Check serum potassium and magnesium at baseline and periodically, and correct deficits promptly.
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?
Pro+ members
Unlock the full page
Create an account and start a Pro+ trial to unlock the full management advice for Arformoterol and Metolazone, the additional notes, the evidence detail and the whole-prescription interaction checker.
- Full clinical management advice
- Additional notes
- Evidence detail
- Interaction checker for a whole prescription
Try Pro+ free for 7 days on the web. No card needed.
Other interactions of Metolazone
Other interactions of Arformoterol
Frequently asked questions
Can I take Arformoterol with Metolazone?
MediHelp rates the interaction as moderate. Arformoterol and Metolazone 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 serum potassium, so combined use can cause additive hypokalemia. Arformoterol may also cause ECG changes, so hypokalemia may heighten arrhythmia risk.
How serious is the interaction between Arformoterol and Metolazone?
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 correct deficits promptly.
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.
Full monographs, dosing and an interaction checker in the MediHelp app
Open the complete reference, check multi-drug interactions and use dosing tools in the MediHelp app.
