Finasteride FIN

An FDA-approved medication for male pattern hair loss and enlarged prostate, working by blocking a hormone that shrinks hair follicles. Human trials confirm it regrows hair and helps the prostate, but it also carries a well-documented, sometimes lasting risk of sexual and mood side effects in some users, even after stopping.

Also known as Propecia, Proscar, Finastid, Prostide, Chibro-Proscar, Finasterida, Finpecia

Effects Hormonal Skin and hair

Routes Oral

Legal status Prescription drug

WADA Not listed

3D Molecular Structure of C₂₃H₃₆N₂O₂

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Chemistry

Formula: C23H36N2O2
Molar mass: 372.5
CAS: 98319-26-7
PubChem CID: 57363
IUPAC name: (1S,3aS,3bS,5aR,9aR,9bS,11aS)-N-tert-butyl-9a,11a-dimethyl-7-oxo-1,2,3,3a,3b,4,5,5a,6,9b,10,11-dodecahydroindeno[5,4-f]quinoline-1-carboxamide
InChIKey: DBEPLOCGEIEOCV-WSBQPABSSA-N

Reported dosing

Approved label

What has been reported in the literature and by users. This is a record of what is done, not a recommendation.

Typical dose 1 mg/day (hair loss) or 5 mg/day (BPH)

Reported range 1-5 mg/day depending on indication

Route Oral

Frequency Once daily

Duration Chronic/ongoing (as prescribed)

FDA-approved 5-alpha-reductase inhibitor (Propecia/Proscar); associated in some users with persistent sexual side effects even after stopping (post-finasteride syndrome), a recognized safety signal.

Where this comes from FDA prescribing information

These figures are recorded for reference and are not a recommendation. Dosing is a decision for you and a clinician.