Copaxone (Glatiramer Acetate) is used in the treatment of relapsing-remitting multiple sclerosis.
Last year, US Court of Appeals for the Federal Circuit reversed a district court's earlier finding related to Teva's US Patent for the drug.
The Appeals Court's ruling allowed the Indian drug maker along with its marketing partner to launch the generic Copaxone in May 2014, subject to FDA approval.
Natco shares crashed nearly 15 per cent to Rs 677.90 during afternoon trading on the BSE.
The drug makers involved in generic forms of Copaxone are Sandoz Inc and its partner Momenta Pharmaceuticals Inc and Mylan Inc and its partner Natco Pharma Ltd.
Branded Copaxone reportedly has accounted for about 20 per cent of sales and 50 per cent of its profits of Teva, the world's largest generic drug maker.
According to Teva's annual report, the drug product is estimated to have clocked revenues, in USA, of over USD 4.2 billion during 2013.
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