It seems most probably you had male pattern baldness
and the prescription suggested by your doctor is perfectly fine. Firstly one month period is a small time to notice much visible result and secondly use of minoxidil
can initially lead to increased hair shedding. This hair fall
is basically of telogen hair(that were actually meant to fall). So there is nothing much to worry. You need to continue medication atleast for four months to notice desirable results. Whenever in doubt, always make it a point to consult your doctor as compliance to medicines depends a lot on the trust that you invest in your doctor. Take care.