Drug interactions
Dexamethasone + Metolazone
Severity: Moderate
Dexamethasone 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 promote potassium loss, so combined use increases the risk of hypokalaemia. Low potassium can predispose to muscle weakness and cardiac arrhythmias.
What this interaction means in plain words
Dexamethasone 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.
Dexamethasone belongs to Endocrine; Metolazone belongs to Cardiovascular.
Why it happens
Additive kaliuresis: metolazone increases distal sodium delivery and potassium excretion, and corticosteroids add some mineralocorticoid-related potassium loss.
What to do
Monitor serum potassium and magnesium regularly and replace or add a potassium-sparing agent if levels fall.
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
Other interactions of Dexamethasone
- Bcg vaccine live + Dexamethasone Contraindicated
- Dexamethasone + Mifepristone Contraindicated
- Dexamethasone + Rilpivirine Contraindicated
- Dexamethasone + Smallpox vaccine live Contraindicated
- Dexamethasone + Varicella virus vaccine live Contraindicated
- Dexamethasone + Yellow fever vaccine Contraindicated
Frequently asked questions
Can I take Dexamethasone with Metolazone?
MediHelp rates the interaction as moderate. Dexamethasone 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 promote potassium loss, so combined use increases the risk of hypokalaemia. Low potassium can predispose to muscle weakness and cardiac arrhythmias.
How serious is the interaction between Dexamethasone 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: Monitor serum potassium and magnesium regularly and replace or add a potassium-sparing agent if levels fall.
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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