Dong-A PharmTech Co. Ltd., announced that its U.S. partner, Warner Chilcott plc, has initiated two, phase III trials for udenafil, a new long acting drug under development for erectile dysfunction (ED). Each randomized, double-blind, placebo-controlled trial is designed to evaluate the safety and efficacy of udenafil, an orally administered selective inhibitor of phosphodiesterase versus placebo. The trials will be conducted in 80 sites in the U.S. and will enroll approximately 1,120 subjects with ED.