Finasteride

Pronounced fin-AS-ter-ide

Brand names: Proscar, Propecia

Type: 5-alpha reductase inhibitor (prostate and hair medicine) · All Other Medicines

What Finasteride is used for

  • Enlarged prostate
  • Male pattern hair loss (lower-amount product)

Common side effects

  • Reduced sex drive
  • Erection problems
  • Reduced semen amount
  • Breast tenderness

Important cautions

  • Lowers the PSA blood test reading by roughly half — prostate cancer screening results must be interpreted with this in mind
  • Women who are or may become pregnant must not handle crushed or broken tablets, as it can affect a male baby's development

How it comes

Tablets. This guide lists forms only — it never lists strengths or doses.

Please note: This page is a patient-education summary, not medical advice, and it deliberately contains no doses. Medicines affect everyone differently — always follow your own prescription and talk to your doctor or pharmacist before starting, stopping or changing any medicine.