Most Finasteride side effects are mild, dose-related and settle as treatment continues. The reactions that matter clinically are rare but need to be recognised quickly.
Key takeaways
- Common effects: reduced libido, erectile changes in a minority, breast tenderness.
- Avoid Finasteride in women who are or may become pregnant must not handle crushed tablets.
- Dose-related effects often resolve by stepping back one strength.
- Severe or persistent reactions warrant stopping and seeking review.
Frequency bands
| Frequency | Reactions | Action |
|---|---|---|
| Very common (>10%) | reduced libido, erectile changes in a minority | Usually self-limiting; supportive measures and reassurance. |
| Common (1–10%) | breast tenderness | Review dose and timing; consider dose reduction. |
| Uncommon (<1%) | hypersensitivity, marked laboratory changes | Stop and arrange clinical assessment. |
| Rare | serious organ-specific reactions | Stop immediately; urgent medical attention. |
Reducing the burden
Take Finasteride exactly as directed: 1 mg once daily for hair loss; 5 mg daily for BPH. Splitting titration into smaller steps, dosing with food where the label allows, and hydrating well cover most tolerability problems seen in practice.
Finasteride at a glance
| Attribute | Detail |
|---|---|
| Drug class | 5-alpha reductase inhibitor |
| Common brand | Propecia / Proscar |
| Licensed use | androgenetic alopecia and BPH |
| Available strengths | 1 mg, 5 mg |
| Dosage form | film-coated tablet |
| Typical onset | shedding stabilises by month 3, regrowth by months 6–12 |
| Duration / dosing interval | 24-hour dosing interval |
| Storage | below 30 °C |
