Shedding after switching from Propecia to Proscar?

In my opinion, if you're using brand name on both prescriptions there should not be a difference. I would consult with a hair loss expert to rule out other causes of your shedding.PRPHAIRMD.COM 

Some men rarely shed after switching. You'll need to see your physician to decide what's best because there are many potential factors here. But for my own patients who shed after switching, I often advise to go back (provided this is the only factor in question).

Generic Proscar and Propecia are both finasteride and in the USA both trade name drugs and the generics are equivalent if you purchase them from a reputable pharmacy.