UPDATE 1-Lilly's new migraine drug pulls ahead of Amgen in fierce battle for new prescriptions

Eli Lilly and Co has pulled ahead in a three-way race with Amgen Inc and Teva Pharmaceutical Industries Ltd in attracting new patients to a new class of migraine drugs, and seeks to build on that advantage by stressing that its therapy can completely prevent headaches in a small percentage of patients. Weekly U.S. prescription data from IQVIA, an analytics provider to the life sciences industry, showed that Lilly’s therapy Emgality claimed the largest share of fi