Pfizer logo on glass office building facade with sky reflections, South San Francisco, California, October 16, 2025. (Photo by Smith Collection/Gado/Getty Images)Gado via Getty ImagesNovo Nordisk has launched a rival bid for U.S. obesity biotech firm Metsera, directly challenging an existing offer from Pfizer.The move, announced Thursday, escalates the competition between the two pharmaceutical giants for a critical advantage in the highly lucrative weight-loss drug market. Novo Nordisk, already dominant wi ...