2-Mercaptopyridine N-oxide sodium has bactericidal effect and is against a standard strain of Mycobacterium tuberculosis H37Rv (ATCC 27294) with MIC90 of 7.20 μM. 2-Mercaptopyridine N-oxide sodium and its complex with iron, gallium, and bismuth have good anti-M. tuberculosis activity. 2-Mercaptopyridine N-oxide sodium has potential for the treatment of tuberculosis.