Nifty Pharma fell nearly 5% on Friday after US President Donald Trump warned of future tariffs on the pharmaceutical sector.Aurobindo Pharma, Laurus Lab, Lupin, and Aurobindo Pharma were among the companies that saw a decline in their stock prices.The US is considering the pharmaceutical sector as a separate category and tariffs for the industry will be announced soon.Investors have become cautious of the segment due to Trump's announcement.