Resolution of Sexual Side Effects After Stopping Finasteride
Approximately 50% of men who develop sexual side effects from finasteride will experience resolution after discontinuing the medication, though this data comes from limited evidence and the timeline for resolution averages 84 weeks for some parameters.
Key Evidence on Resolution Rates
The most direct evidence addressing your question comes from the PLESS trial 1, which found that among men who discontinued finasteride specifically due to sexual adverse events:
- 50% experienced resolution of their sexual dysfunction after stopping finasteride
- 41% of placebo patients who discontinued also experienced resolution (suggesting some sexual dysfunction may be unrelated to the drug)
However, this 50% resolution rate should be interpreted with important caveats:
Critical Nuances and Limitations
The resolution data is incomplete and potentially optimistic:
- The FDA label 2 notes that semen parameters (ejaculate volume, sperm count) returned to baseline after discontinuation with an average time of 84 weeks - nearly 2 years
- The label also includes postmarketing reports of persistent sexual dysfunction that continued after discontinuation 22, though specific percentages are not provided
- Only 4% of finasteride patients discontinued due to sexual side effects in the PLESS trial 1, suggesting the 50% resolution rate applies to a self-selected subset who found symptoms severe enough to stop
The other 50% may experience persistent symptoms:
Recent evidence suggests post-finasteride syndrome is a real clinical entity 3, with persistent or irreversible sexual, neurological, and mental side effects in a subset of men. This includes:
- Persistent decreased libido
- Erectile dysfunction
- Reduced penile sensitivity
- These symptoms can persist months to years after discontinuation 4
Clinical Implications
When counseling patients about stopping finasteride:
- Inform them that roughly half may see resolution of sexual side effects after discontinuation
- The other half may experience persistent symptoms of unclear duration
- Resolution, when it occurs, may take months to nearly 2 years based on semen parameter data
- There is no proven treatment for persistent post-finasteride sexual dysfunction 3
Risk factors for persistent symptoms remain poorly characterized, and we cannot predict which patients will experience resolution versus persistence.
The guideline evidence 55 notes that sexual dysfunction associated with finasteride decreased over time during treatment, but does not specifically address post-discontinuation resolution rates beyond the PLESS trial data.