Drug interactions
Metolazone + Parecoxib
Severity: Moderate
Metolazone and Parecoxib: 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
Parecoxib, converted to the NSAID valdecoxib, may reduce the diuretic and antihypertensive effect of metolazone. The pair also increases the risk of acute kidney injury, especially in dehydrated or elderly patients.
What this interaction means in plain words
Metolazone and Parecoxib 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
COX-2 inhibition reduces renal prostaglandins, causing sodium retention and lower renal perfusion that oppose diuretic action.
What to do
Monitor blood pressure, fluid status and renal function, keep patients hydrated, and use the shortest course possible.
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 Parecoxib?
MediHelp rates the interaction as moderate. Metolazone and Parecoxib 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. Parecoxib, converted to the NSAID valdecoxib, may reduce the diuretic and antihypertensive effect of metolazone. The pair also increases the risk of acute kidney injury, especially in dehydrated or elderly patients.
How serious is the interaction between Metolazone and Parecoxib?
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, fluid status and renal function, keep patients hydrated, and use the shortest course possible.
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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