The men in the studies were randomly assigned to receive 5 mg, 1 mg, 0.
Statistically, the 1mg dosage will give slightly better regrowth for the average user.
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It comes with serious risks if you do not take it as prescribed.
These can include decreased sex drive, trouble getting or keeping an erection, ejaculation disorder, increase in breast size or tenderness, and rash.
Due to this effect, Propecia not only prevents hair loss, but also stimulates the growth of new hair.