How Long Does It Take Propecia® to Work?
While Propecia® begins to work immediately, it might take as long as three months, and sometimes more, to notice you are losing less hair. It takes longer to see hair thicken or strengthen. This can take from six to 12 months.
According to Merck, the pharmaceutical company that makes Propecia®, if after 12 months no noticeable effects have occurred, it is unlikely that you will see any favorable results. In general, you cannot regrow all the hair that you have lost.
The difference between men treated with Propecia® and men given a placebo continued to increase. At the beginning of a five year clinical study, the baseline hair count in Propecia® versus placebo-treated men was 876 hairs in a one-inch diameter of scalp. At the end of the first year, those taking Propecia® averaged 126 more hairs than those on a placebo.
At the end of the fifth year of the study, 65 percent of men taking Propecia® were found to maintain or increase their hair count. By contrast, at this point in the study, the hair count of all of the men on the placebo decreased.
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