Minoxidil 2% solution.............?

so i was experiencing a lot of hairfall.....n i hv vvv less hairs on my scalp..but i m nt bald...i just hav a little less hairs in comparison to normal amt of hairs......i want to ask....tht is it suitable for 14 year children....as i m 14.5 yrs only...n doctor has advised me to use it........but is it alrite to use it? or will i loose more hairs ?.....n in how much tym will i see noticeable results.......???