How effective is Propecia for treating hair loss?

How effective is Propecia for treating hair loss?Propecia (Finasteride) is not a miracle hair loss treatment, but it works reasonably well for many people. Results tend to be slow, and it appears to be much better at retaining than regrowing hair. But as treatments go, it's fairly effective. Recent longer term results indicate that it continues to work well for responders (i.e., the majority of