Drug interactions
Fludrocortisone + Glycerol phenylbutyrate
Severity: Moderate
Fludrocortisone and Glycerol phenylbutyrate: 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
Corticosteroids promote protein breakdown and can raise plasma ammonia, which counteracts the ammonia-lowering goal of glycerol phenylbutyrate in urea cycle disorders. This may risk hyperammonemia.
What this interaction means in plain words
Fludrocortisone and Glycerol phenylbutyrate 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.
Fludrocortisone belongs to Endocrine; Glycerol phenylbutyrate belongs to Miscellaneous.
Why it happens
Corticosteroid-driven protein catabolism increases nitrogen load and ammonia production, opposing the nitrogen scavenging effect.
What to do
Monitor plasma ammonia closely when fludrocortisone is started or adjusted, and adjust the glycerol phenylbutyrate dose or protein intake as needed.
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 Glycerol phenylbutyrate
- Dexamethasone + Glycerol phenylbutyrate Major
- Glycerol phenylbutyrate + Sodium valproate Major
- Glycerol phenylbutyrate + Valproic acid Major
- Cyclosporin + Glycerol phenylbutyrate Moderate
- Dexamethasone-neomycin-polymyxin + Glycerol phenylbutyrate Moderate
- Dexamethasone-tobramycin + Glycerol phenylbutyrate Moderate
Frequently asked questions
Can I take Fludrocortisone with Glycerol phenylbutyrate?
MediHelp rates the interaction as moderate. Fludrocortisone and Glycerol phenylbutyrate 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. Corticosteroids promote protein breakdown and can raise plasma ammonia, which counteracts the ammonia-lowering goal of glycerol phenylbutyrate in urea cycle disorders. This may risk hyperammonemia.
How serious is the interaction between Fludrocortisone and Glycerol phenylbutyrate?
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 plasma ammonia closely when fludrocortisone is started or adjusted, and adjust the glycerol phenylbutyrate dose or protein intake as needed.
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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