Key Takeaways Shares of several drugmakers fell Wednesday as the threat of tariffs on the industry loomed.President Donald Trump said at an event Tuesday that "a major tariff" was coming to the pharmaceutical industry.

Drugmakers have said they’re still unclear about whether Trump will impose tariffs on finished products or on active pharmaceutical ingredients.

The $1.7 trillion revenue prescription drug industry has a relatively robust immunity to tariffs. Last Wednesday, when U.S. President Donald Trump unveiled a raft of duties on countries and industries he held back on hitting pharmaceuticals.