Biotech Values

[genisi]

Upon U.S. approval, Copaxone was granted Hatch-Waxman exclusivity (5 years) and Orphan Drug status (7 years). Those expired on 2001 and 2003 respectively.
Generic manufacturers were allowed to file a Paragraph IV at year 4 of the exclusivity period. So Copaxone generics could technically be file back in 2000.
I think there's more than one reason why it was not challenged yet.