Suggest Medication For Hair Growth

Sir, my hair started falling 5 years ago and my head became vacant from sides and bottom back. I started treatment that time and till now i've shown myself to more than 5 doctors but nothing positive yet happened. After leaving all sorts of treatment and making my head bald, my rest hair stoped falling but still the vacant areas are not growing up with hair. I need ur intense help to get my bald places back with hair..