Comparative Pharmacology
Head-to-head clinical analysis: ADCIRCA versus ENTADFI.
Peer-Reviewed Evidence
Head-to-head clinical analysis: ADCIRCA versus ENTADFI.
ADCIRCA vs ENTADFI
Comparing the clinical profiles, pharmacokinetic behaviors, and safety indices of these two therapeutic agents.
Phosphodiesterase-5 (PDE5) inhibitor; increases cGMP in pulmonary vascular smooth muscle, leading to vasodilation.
Combination of a 5α-reductase inhibitor (finasteride) and a phosphodiesterase 5 inhibitor (tadalafil). Finasteride inhibits type II 5α-reductase, preventing conversion of testosterone to dihydrotestosterone, reducing prostate growth. Tadalafil inhibits PDE5, increasing cGMP in smooth muscle, causing relaxation of the prostate and bladder neck.
10 mg orally three times daily.
5 mg orally once daily.
None Documented
None Documented
Terminal half-life: 10–15 hours in healthy adults; prolonged in hepatic impairment (Child-Pugh B/C: up to 30 hours); clinical context: supports twice-daily dosing
Finasteride: terminal half-life ~6-8 hours (range 4-12 h) in young adults, 8 hours in elderly. Tadalafil: terminal half-life ~17.5 hours (range 11-28 h), supporting once-daily dosing.
Renal: ~70% (metabolites and unchanged drug), Fecal: ~20%, Biliary: minor
ENTADFI (finasteride 5 mg and tadalafil 5 mg) is a fixed-dose combination. Finasteride is excreted 57% in feces (as metabolites) and 39% in urine (<1% as unchanged). Tadalafil is excreted primarily as metabolites, with 61% in feces and 36% in urine; <0.001% of dose is excreted unchanged in urine.
Category C
Category C
PDE5 Inhibitor
5-Alpha Reductase Inhibitor and PDE5 Inhibitor