Barr Pharmaceuticals Inc. confirmed today that its Pomona-based subsidiary, Barr Laboratories Inc., has challenged four patents held by Amgen Inc. for its Sensipar drug, used by dialysis patients to treat side-effects of the treatment.
Barr said it filed an Abbreviated New Drug Application with the Food and Drug Administration on March 10, the first date the agency could accept such an application for the kidney drug.
On Monday, Amgen, along with patent partners Brigham and Womenâ€™s Hospital Inc. and NPS Pharmaceuticals Inc., filed suit against Barr and Israeli drug-maker Teva Pharmaceutical Industries Ltd. for planning to sell generic Sensipar before the expiration of patent protection.
Sensipar recorded $377 million in U.S. sales during the 12 months ending May, Barr said.
Teva, the world’s largest generic-drug maker, is buying Montvale, N.J.-based Barr for $9 billion, the companies said jointly earlier this month.
Shares of Barr were down fractionally in noontime trading to $65.81 a share.