Finasteride (Proscar)

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General information

Class/mechanism: 5 alpha-reductase inhibitor; inhibits conversion of testosterone to dihydrotestosterone (DHT). Specifically and competitively inhibits Type II 5α-reductase by forming a stable enzyme-drug complex.[1][2]
Route: PO
Extravasation: n/a

For conciseness and simplicity, currently will focus on treatment regimens and not list information such as: renal/hepatic dose adjustments, metabolism (including CYP450), excretion, monitoring parameters (although this will be considered for checklists), or manufacturer. Instead, for the most current information, please refer to your preferred pharmacopeias such as Micromedex, Lexicomp, UpToDate (courtesy of Lexicomp), or the prescribing information.[1]

Patient drug information


  1. 1.0 1.1 Finasteride (Proscar) package insert
  2. Finasteride (Proscar) package insert (locally hosted backup)
  3. Finasteride (Proscar) patient drug information (UpToDate)