Hi I Am 19 Years Old My Hair Density Is

Hi I am 19 years old my Hair density is decreasing on top of the head comparing .my father have hair fall problem .I go to doctors he suggests use me androanagen solution and give some tablets .
Are my Hair density is increased are not?
I obscured 3 weake I have no improvement.
I don't that after applying that solution we do head broth are no I don't no?
Give some sagetion doctors