Drug interactions
Conivaptan + Fludrocortisone
Severity: Moderate
Conivaptan 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
Conivaptan is a CYP3A4 inhibitor and could raise fludrocortisone levels. Conivaptan raises serum sodium, while fludrocortisone retains sodium, so the combination could cause excessively rapid sodium correction or fluid shifts.
What this interaction means in plain words
Conivaptan 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.
Why it happens
CYP3A4 inhibition by conivaptan, plus opposing and additive effects on sodium and water balance.
What to do
Monitor serum sodium frequently to avoid overly rapid correction, and monitor blood pressure and potassium. Reduce the fludrocortisone dose if mineralocorticoid effects increase.
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
Frequently asked questions
Can I take Conivaptan with Fludrocortisone?
MediHelp rates the interaction as moderate. Conivaptan 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. Conivaptan is a CYP3A4 inhibitor and could raise fludrocortisone levels. Conivaptan raises serum sodium, while fludrocortisone retains sodium, so the combination could cause excessively rapid sodium correction or fluid shifts.
How serious is the interaction between Conivaptan 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 sodium frequently to avoid overly rapid correction, and monitor blood pressure and potassium. Reduce the fludrocortisone dose if mineralocorticoid effects increase.
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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