Complete adverse effect profile including incidence rates and management
Important Safety Information
This is not a complete list of all possible side effects. Contact your healthcare provider if you experience any unexpected symptoms. For serious or life-threatening side effects, seek emergency medical attention immediately.
Decreased libido (3.7%)
Erectile dysfunction (3.7%)
Decreased ejaculatory volume
Gynecomastia (breast tenderness/enlargement) — 0.5–2%
Decreased PSA levels (~50% reduction — important for prostate cancer screening interpretation)
Post-finasteride syndrome (controversial but reported): persistent sexual dysfunction, depression, cognitive impairment after stopping — mechanism debated
Increased risk of high-grade prostate cancer (PCPT trial finding — may represent detection bias from PSA reduction)
Depression and suicidal ideation (FDA safety communication 2012)
Breast cancer (rare cases in men)
Hypersensitivity reactions
Testicular pain
Like all medications, Finasteride can cause side effects. However, not everyone who takes this medication will experience them. Many side effects are dose-dependent and may improve as your body adjusts to the medication. Others may require dose adjustment or medical attention.
Contact your healthcare provider promptly if you experience:
Seek immediate emergency medical care if you experience signs of: