Drug interactions
Fludrocortisone + Rifapentine
Severity: Major
Fludrocortisone and Rifapentine: major interaction.
Last updated Sources: UK SmPC
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
Rifapentine is a CYP3A4 inducer and can substantially accelerate corticosteroid metabolism, reducing the effect of fludrocortisone. Patients on replacement therapy may develop adrenal insufficiency symptoms such as hypotension and electrolyte disturbances.
What this interaction means in plain words
Fludrocortisone and Rifapentine can interact in a way that may be serious. Using them together is sometimes necessary, but it needs a deliberate decision by the prescriber, a plan for monitoring, and clear advice on the warning signs to watch for.
Fludrocortisone belongs to Endocrine; Rifapentine belongs to Anti Bacterial.
Why it happens
Induction of CYP3A4 by rifapentine increasing corticosteroid clearance.
What to do
Monitor blood pressure, sodium and potassium closely and increase the fludrocortisone dose as needed. Reassess the dose after rifapentine is stopped.
What to ask your pharmacist
- Does the benefit of taking both outweigh the risk in my case?
- Do I need any blood test, ECG or other check while on both?
- What early warning signs should I watch for, and what should I do if they appear?
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References
- Fludrocortisone acetate 0.05mg tablets - SmPC sections 4.3/4.5 (class statement: Hepatic Enzyme Inducers; "Hepatic Enzyme Inducers (e.g. aminoglutethemide, barbiturates, carbamazepine, phenytoin, primidone, rifabutin, rifampicin): There may be increased metabolic cle") — electronic medicines compendium (UK SmPC)
Other interactions of Fludrocortisone
Other interactions of Rifapentine
- Ledipasvir-sofosbuvir + Rifapentine Contraindicated
- Lorlatinib + Rifapentine Contraindicated
- Lurasidone + Rifapentine Contraindicated
- Ranolazine + Rifapentine Contraindicated
- Rifapentine + Sofosbuvir-velpatasvir Contraindicated
- Rifapentine + Sofosbuvir-velpatasvir-voxilaprevir Contraindicated
Frequently asked questions
Can I take Fludrocortisone with Rifapentine?
MediHelp rates the interaction as major. Fludrocortisone and Rifapentine can interact in a way that may be serious. Using them together is sometimes necessary, but it needs a deliberate decision by the prescriber, a plan for monitoring, and clear advice on the warning signs to watch for. Rifapentine is a CYP3A4 inducer and can substantially accelerate corticosteroid metabolism, reducing the effect of fludrocortisone. Patients on replacement therapy may develop adrenal insufficiency symptoms such as hypotension and electrolyte disturbances.
How serious is the interaction between Fludrocortisone and Rifapentine?
MediHelp rates it major, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Monitor blood pressure, sodium and potassium closely and increase the fludrocortisone dose as needed. Reassess the dose after rifapentine is stopped.
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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