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Now that a more potent version of Rogaine has joined Propecia on drugstore shelves, some 33 million American men who have been anxiously counting the hairs in their combs have more options. Here is how they measure up:

How They Work
PROPECIA Propecia contains 1 milligram of finasteride, a drug that has also been prescribed to treat men with enlarged prostates. It affects dihydrotestosterone, or DHT, the active form of the male hormone that contributes to male pattern baldness. Merck, the drug’s manufacturer, said that in studies, 83 percent of those taking Propecia maintained or increased their hair count in two years, while 72 percent of those who did not take the drug lost hair.
ROGAINE EXTRA STRENGTH Rogaine’s new formula has been increased from a 2 percent to a 5 percent solution of minoxidil, a drug that has been used to lower blood pressure. Although scientists are not exactly sure how it works, minoxidil acts directly on the follicle to stimulate hair growth. Pharmacia & Upjohn, Rogaine’s maker, reported that in clinical studies four of five users said the new product slowed or stopped hair loss.

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