Drug interactions
Dexamethasone + Fludrocortisone
Severity: Moderate
Dexamethasone and Fludrocortisone: 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
Dexamethasone can induce CYP3A4 and may modestly increase fludrocortisone clearance. More importantly, both have glucocorticoid or mineralocorticoid effects that can add to hypokalemia and fluid retention.
What this interaction means in plain words
Dexamethasone and Fludrocortisone 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; Fludrocortisone belongs to Endocrine.
Why it happens
Possible CYP3A4 induction by dexamethasone plus additive potassium-wasting and sodium-retaining effects.
What to do
Monitor serum potassium, blood pressure and fluid status. Adjust fludrocortisone dose according to clinical response.
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 Fludrocortisone
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 Fludrocortisone?
MediHelp rates the interaction as moderate. Dexamethasone and Fludrocortisone 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 can induce CYP3A4 and may modestly increase fludrocortisone clearance. More importantly, both have glucocorticoid or mineralocorticoid effects that can add to hypokalemia and fluid retention.
How serious is the interaction between Dexamethasone and Fludrocortisone?
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, blood pressure and fluid status. Adjust fludrocortisone dose according to clinical response.
What other medicines interact with Fludrocortisone?
MediHelp also lists interactions of Fludrocortisone with, for example, Mifepristone, Aldesleukin, Amphotericin b. The full list is on the Fludrocortisone page.
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