We assessed the incidence of adverse drug reactions(ADRs)with anti-TB medications and evaluated the risk factors for developing ADRs in previously treated tuberculosis patients in China.All patients received the first-line anti-TB regimen(2HREZS/6HRE)as recommended by the national guidelines.Clinical and laboratory evaluations were performed once a month.Out of the 354 We assessed the incidence of adverse drug reactions (ADRs) with anti-TB medications and evaluated the risk factors for developing ADRs in previously treated tuberculosis patients in China. All patients received the first-line anti-TB regimen (2HREZS / 6HRE) as recommended by the national guidelines. Clinical and laboratory evaluations were performed once a month