Info. about Minoxidil

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People! im just 24 with 30 or 35% of my hair gone with the wind. lolz
I want to ask from users of minoxidil that
1. what is your expereince about it? does it help?
2. please tell me the real sides of minoxidil.
3. what is the cheapest brand around? since i can not afford expensive treatments.