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Studies have shown, In general, men who took PROPECIA maintained or increased the number of visible scalp hairs and noticed improvement in their hair in the first year, with the effect maintained in the second year. Hair counts in men who did not take PROPECIA continued to decrease. This study is now in its fourth year and results will be updated in the near future. 86% of the men treated with PROPECIA had no further hair loss, compared to 42% in the placebo treated group (based on any decrease in vertex hair growth compared with 7% of men receiving placebo).
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Propecia Information from merck.com
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PROPECIA* (finasteride), a synthetic 4-azasteroid compound, is a specific inhibitor of steroid Type II 5a-reductase, an intracellular enzyme that converts the androgen testosterone into 5a-dihydrotestosterone (DHT).
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FDA Information about Hair Loss and Propecia
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In the United States, some 35 million men are losing or have lost their hair from male-pattern baldness, according to the American Hair Loss Council. Approximately 20 million women have experienced a similar loss of hair (from female-pattern hair loss), and an estimated 2.5 million Americans have lost their hair due to other causes.
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Journal of the American Academy of Dermatology
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Results: There was a significant increase in hair count in the frontal scalp of finasteride-treated patients (P < .001), as well as significant improvements in patient, investigator, and global photographic assessments. Efficacy was maintained or improved throughout the second year of the study. Finasteride was generally well tolerated.
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