|  | Propecia and Rogaine work in completely different ways to slow or stop hair loss. Propecia is a pill taken once daily, while Rogaine is a liquid that is applied to the scalp twice daily.  Propecia works by inhibiting the production of a hormone called DHT that is known to be a catalyst in causing hair loss. Studies have shown that almost 80% of men using Propecia stopped or even reversed their hair loss to some degree. 
 
 
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