i would have no idea! what country did you buy them from, and from what company?
if you're worried, a lot of people on this forum use inhousepharmacy.com or unitedpharmacies, buying generics like CIPLA and dr reddy's finast...they should deliver to wherever you are.
Why don't you just cut proscar in 4ths or 5ths and pay just $20 per month. How much where those generics? What does the experation date mean? Half of it broke down already? If so, cut the proscar in eighths and get just as much for $10 per month.