If you think about it, the actual dollars and cents impacted.
For pharmaceutical, the cost of production is likely very low and margin very thick. It's the R&D that is expensive. A levy of 100 pct on a few cents won't be great to the producers. They can't tax on R&D and R&D cost can still be used to reduce taxes.
Those pharmaceutical choose to produce here is likely due to other political, operation or trading reasons rather than lowering production cost. If that's the purpose, they could have done it in other cheaper places, to run.
The greatest loser will be the American residents, because the pharmaceutical will pass the cost and they will use the opportunity to jack up the price higher. It won't be few cents of increase, they will use the opportunity to increase by a bigger margin.
Even if the pharmaceutical wanna entertain Donald trump and pull operations back. They probably still produce it in the other countries, send the processed material to USA to do packaging. Produced in USA has a broad definition, it can be just semi produced or packaged there.
Tldr: Likely nothing to worry but I'm more worried that PAP, like those pharmaceutical companies, use the opportunity to jack up prices or create some indirect taxes.