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President Donald Trump is back at it with his tariff threats for pharma, promising massive levies on generic drug imports starting in 2028.

The president’s proposal — which was announced on Truth Social and has yet to be solidified via an official proclamation or notice — is framed as a push to encourage domestic drug manufacturing.

Trump outlined a 100% tariff on generic drugs originating from outside the U.S. starting on Aug. 1, 2028, which would be increased to 200% the following year.

But the conditions that have long kept generic drug manufacturing out of the U.S. largely haven’t changed and Trump’s most recent plan might only succeed in making drugs more expensive while failing to bring factories stateside, according to Tinglong Dai, the Bernard T. Ferrari professor of business at Johns Hopkins Carey Business School.