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Shares of Eli Lilly

and Novo Nordisk

dropped Friday, after President Donald Trump said his administration aims to cut the cost of brand name GLP-1 weight loss drugs to $150 per month, a fraction of their current list price.

“In London, you’d buy a certain drug for $130 and even less than that ... $88 as of... a month ago. And in New York, you pay $1,300 for the same thing,” Trump said during a Thursday afternoon event about in vitro fertilization at the White House. “Instead of $1,300 you’ll be paying about $150 and they’ll be paying $150 so we’re going to pay the same thing.”