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[Effect of proteolytic enzymes on antibiotic distribution when the preparations are administered by different routes].

The effect of proteolytic enzymes, such as terrilitine and chymotripsin on pharmacokinetics of morphocycline and streptomycin in rats after their administration by various routes was studied comparatively. The oral use of the enzymes or their introduction directly into the duodenum simultaneously or 30 minutes before the antibiotic administration did not increase the morphocycline and streptomycin levels in the biosubstrates tested. A tendency to a decrease in the serum and organ levels of the antibiotics in animals when used orally in combination with the enzymes was noted. When the drugs were administered intramuscularly, the morphocycline serum and organ levels in the rats increased insignificantly, while the streptomycin levels increased significantly. Administration of formalin as a stressor had an analogous effect which provided a supposition of a possibility of non-specific effect of the enzymes of distribution of the antibiotics on intramuscular injection of the enzymes in large doses having a local irritating effect.