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Tissue Penetration of a novel spectinamide antibiotic for the treatment of tuberculosis

The in vivo biodistribution and pharmacokinetics of 1329, a novel spectinamide antibiotic with anti-tubercular activity, were studied during intravenous administration of an tritium-labeled compound for nine consecutive, 12-hourly doses to rats. Serial blood samples were collected after the first and the eighth dose, and major organs and tissues were collected 1 h after the ninth dose. Urinary and fecal excretion was monitored throughout the dosing period. Radioactivity in the collected samples was assessed by scintillation counting. During the course of treatment, 86.6% of the administered radioactivity was recovered in urine, feces, organs, and muscle tissue. Urinary excretion was the major route of elimination, with 70% of radioactivity recovered from urine and 12.6% from feces. | Tissue Penetration of a novel spectinamide antibiotic for the treatment of tuberculosis