Trecator SC has antimicrobial activity against mycobacteria tuberculosis of different strains. It acts bacteriostatically, inhibits reproduction and growth of mycobacterium tuberculosis with intracellular and extracellular location. Trecator SC is prescribed when the patient is diagnosed with streptomycin-resistant and isoniazid-resistant staffs, as well as in case of the ineffectiveness of first-line anti-tuberculosis medications, including as part of complex tuberculostatic therapy.