FIELD: veterinary science. SUBSTANCE: preparation has tylosin and laevomycetin and solvents, vehicles, stabilizing and preserving agents also in the following ratio of components, wt.%: tylosin, 0.25-50.0; laevomycetin, 2.5-90.0; solvents or vehicles, stabilizing agents, preserving agents up to 100. Combined use of tylosin and laevomycetin ensures to enhance the therapeutic effectiveness by 2.13% and 2.64%, respectively, as compared with distinct use of tylosin and laevomycetin and to decrease tylosin concentration by 5-fold. EFFECT: enhanced effectiveness of preparation. 3 tbl, 5 ex
