Pfizer hikes U.S. prices for over 100 drugs on January 1

(Reuters) - Pfizer Inc , which plans a $160-billion merger with Ireland-based Allergan Plc to slash its U.S. tax bill, on Jan. 1 raised U.S. prices for more than 100 of its drugs, some by as much as 20 percent, according to statistics compiled by global information services company Wolters Kluwer.