An antituberculosis drug which acts bacteriostatically; it enters the actively growing cells of mycobacteria by inhibiting RNA synthesis, interferes with cellular metabolism, causing cessation of reproduction and death of bacteria. Active only in relation to the intensively dividing cells. Inhibits the growth and reproduction of tuberculosis mycobacterium resistant to streptomycin, isoniazid, PASK, ethionamide, kanamycin. In the conditions of monotherapy, the resistance of mycobacteria develops fast enough.