Comparative Pharmacology
Head-to-head clinical analysis: FLAC versus HC HYDROCORTISONE.
Peer-Reviewed Evidence
Head-to-head clinical analysis: FLAC versus HC HYDROCORTISONE.
FLAC vs HC (HYDROCORTISONE)
Comparing the clinical profiles, pharmacokinetic behaviors, and safety indices of these two therapeutic agents.
FLAC (Fluorouracil) is a pyrimidine analog that inhibits thymidylate synthase, blocking DNA synthesis. It is converted to active metabolites (FdUMP, FUTP) that disrupt RNA function and DNA replication.
Hydrocortisone is a glucocorticoid that binds to the glucocorticoid receptor, leading to modulation of gene transcription. It inhibits phospholipase A2, reducing prostaglandin and leukotriene synthesis; suppresses inflammatory cytokine production; and causes vasoconstriction and immunosuppression.
Adults: 40 mg orally twice daily.
Hydrocortisone 100-500 mg IV/IM every 2-6 hours as needed for acute adrenal insufficiency or severe inflammation. Maintenance: 20-30 mg/day PO divided every 8-12 hours.
None Documented
None Documented
2-4 hours; prolonged in renal impairment (up to 12 hours)
1.5–2.5 hours (terminal half-life). In clinical context, the biological half-life (duration of HPA suppression) is longer (8–12 hours) due to tissue binding and active metabolites.
Renal: 70% unchanged; Fecal: 20%; Biliary: 10%
Renal: predominantly as conjugated metabolites and a small fraction of unchanged drug. Biliary/fecal: minor, <5%. Total renal clearance accounts for >95% of elimination.
Category C
Category D/X
Corticosteroid
Corticosteroid