A U.S. district court has ruled in favor of Barr Pharmaceuticals in a lawsuit challenging the patent listed by Bayer Schering Pharma in connection with Yasmin(R). The judge found the patent for the oral contraceptive as invalid. Yasmin provides an oral contraceptive regimen consisting of 21 active tablets (each containing 3 mg of drospirenone and 0.03 mg of ethinyl estradiol) and 7 inert tablets.