(Reuters) -Indian pharmaceutical stocks fell 4.4% on Friday, wiping out gains from the previous session, after U.S. President Donald Trump threatened steep tariffs on the sector. "Pharma (tariffs) is going to be starting to come in, I think, at a level that you haven't really seen before," Trump told reporters aboard Air Force One. "That will be announced in the near future, and is under review right now," Trump said.