Be smart.
It causes gymnecostasia(breast enlargement), erectile disfunction(which may be permanent) and depression(many suicide victims have been reported as Propecia users).
The only reason why it is still being sold is because of the money it generates for the drug companies.
Some people do not report side-effects, they are blessed, but I am sceptic about the long term users (no study has been done for more than 5 years usage).
Shave your hair, or if you have the money, visit a hair surgeon for advice.