Previously took Propecia and had no side effects

I took propecia from 2010-2015 with no crazy side effects, but got off it when recovering from a concussion. I held onto most of my hair that I regrew for about 3 years. Now it’s starting to go really fast. If I have already taken propecia years ago, is there any reason to believe I’d get sides now? Does generic make a difference?

The generic should be no different if it is not fake. Your previous experience should be the same now