Hair shedding after 7 months use of minoxidil 5?

Hi, I am using minoxidil 5 for last 7 months .for the first 3 week of usage my hair was shedding like anything. But after that it reduced and I could feel the hair growth also.but now for the last 1 month I am again facing heavy hair fall, like the same I fa e during the first 3 weeks. I am using the minoxidil continuously -same dose. Please suggest .