The United States will impose a 100 per cent tariff on imports of branded or patented pharmaceutical products from October 1, unless a pharmaceutical company is building a manufacturing plant in the US, President Donald Trump said on Thursday.

"There will, therefore, be no Tariff on these pharmaceutical products if construction has started," Trump said on Truth Social.

Pharmaceutical drugs imported to the US were already slapped with a 25 per cent tariff in May.

The US president said the new tariff on any branded or patented pharmaceutical product would apply to all imports unless the company had already broken ground on a manufacturing plant in the United States.

In July, Mr Trump threatened to hit drug manufacturers with a tariff as high as 200 per cent if they did not move manufac

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