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Novo Nordisk

and Eli Lilly

took their GLP-1 pill battle to the preeminent obesity meeting this weekend as they prepare for the next sea change in how patients receive their drugs.

Novo Nordisk on Sunday announced that prescriptions of the Wegovy pill have topped 3 million since it entered the U.S. market about five months ago. The Danish drugmaker's CEO Mike Doustdar celebrated the milestone, saying in an interview with CNBC that Novo was able to accelerate prescriptions even as Lilly introduced its own GLP-1 pill in April.