Propecia showed at a dosage of 5mg per day, as is commonly prescribed for BPH, though much higher than the 1mg generally prescribed for hair loss, participants taking finasteride were 25% less likely to have developed prostate cancer at the end of the trial compared to those taking a placebo.
Further, Finasteride increased the specificity and selectivity of prostate cancer detection, thus, a seemly increased rate of high Gleason grade tumor.
Recognized Propecia side effects, experienced by around >1% of users, include erectile dysfunction, and less often gynecomastia (breast gland enlargement). As expected from its short 6-8 hour half-life, in trial studies, side effects ceased after dosage was discontinued.
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