I am really not sure if that is a good idea. When I started finasteride back in June 2010 my hair started to diffuse which was quite scary... it gradually got better, however my hairline looked very thin. I got stressed out about it, due to the potential sides, therefore I dropped the drug. Two months later I wanted my hair cut short and then realised my hair was thinning all over. So I am unsure on what you should do.
Everyone is different. Why would you want a break from the drug anyway if you are doing so well without sides?