PROPECIA: Hair loss is a condition that affects men both young and old. Propecia (finasteride) is a medication that can help men grow back the hair that they lost. The new hair that you get will even remain for up to 12 months after taking Propecia. It is recommended to have a continuous prescribed plan of Propecia to ensure that you have the hair you want. Clinical studies have shown that some men experienced side effects such as reduced sexual drive, and forms of erectile dysfunction. This occurred in less than 2% of the men that took Finasteride. These effects dissipated after the use of the medication.