hanginginthewire
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Merck was well aware of a 5ARI's effect on hair and the prostate. It's hardly the case that proscar just happened to grow hair. It doesn't always end up working that way, and there is no reason for off label use to always be the case. The story of finasteride is so well known that it is posted right here on wikipedia:
"In 1942, James Hamilton observed that prepubertal castration prevents the later development of male pattern baldness in mature men.[44] In 1974, Julianne Imperato-McGinley of Cornell Medical College in New York attended a conference on birth defects. She reported on a group of intersex children in the Caribbean who appeared sexually ambiguous at birth, and were initially raised as girls, but then grew external male genitalia and other masculine characteristic after onset of puberty. Her research group found these children shared a genetic mutation, causing deficiency of the 5α-reductase enzyme and male hormone dihydrotestosterone (DHT), which was found to have been the etiology behind abnormalities in male sexual development. Upon maturation, these individuals were observed to have smaller prostates which were underdeveloped, and were also observed to lack incidence of male pattern baldness.[45][46]
In 1975, copies of Imperato-McGinley's presentation were seen by P. Roy Vagelos, who was then serving as Merck's basic-research chief. He was intrigued by the notion that decreased levels of DHT led to the development of smaller prostates. Dr. Vagelos then sought to create a drug which could mimic the condition found in these children to treat older men who were suffering from benign prostatic hyperplasia.[47]
Finasteride was developed under the code name MK-906.[citation needed] In 1992, finasteride (5 mg) was approved by the U.S. Food and Drug Administration (FDA) for treatment of BPH, which Merck marketed under the brand name Proscar.[citation needed] In 1997, Merck was successful in obtaining FDA approval for a second indication of finasteride (1 mg) for treatment of male pattern baldness, which was marketed under the brand name Propecia."
Source: https://en.wikipedia.org/wiki/Finasteride#History
All that interesting history, science, and human interest and yet propecia is a pile of worthless sh*t. I can only imagine how excited the forums would have been over it had they existed circa 1991 - 97.