A pedestrian walks past Pfizer Inc. headquarters in New York, U.S., on Monday, Nov. 23, 2015. Pfizer Inc. and Allergan Plc agreed to combine in a record $160 billion deal, creating a drugmaking behemoth called Pfizer Plc with products from Viagra to Botox and a low-cost tax base. Photographer: Michael Nagle/Bloomberg
Michael Nagle/Bloomberg