Stock market today, Sept. 26 -- The domestic benchmark indices, Nifty 50 and Sensex, started lower on Friday, influenced by declines in pharmaceutical stocks following US President Donald Trump's announcement of a 100% tariff on branded and patented medications.

The Nifty 50 declined by 0.29% to reach 24,818.55, while the BSE Sensex fell by 0.25% to 80,956.01, as of 9:15 IST. On Thursday, Trump imposed a new set of heavy tariffs on a wide array of imported products, including branded and patented medications as well as heavy-duty trucks, which will take effect on October 1.

The United States represents slightly over one-third of India's pharmaceutical exports, which mainly consist of lower-cost generic versions of well-known drugs. Expo...