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Is Propecia, then, effective?  It depends what is meant by “effective.”  Based on Figure 1 in Section 14 of the FDA labeling (and recalling the caveats above), Propecia can slow the rate of hair loss and perhaps even increase hair density somewhat (about 100 hairs per square inch over baseline after 12 months, which diminishes to 50 hairs over baseline after year 5).  Can it re-grow hair where there is none?  The FDA-labeling cannot tell us, since those with “complete” hair loss were not included in the studies.  Additional information is available in the FDA’s statistical review.


http://blogs.harvard.edu/billofhealth/2013/01/31/finasteride-as-an-fda-approved-baldness-remedy-is-it-effective/


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