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[Experimental study of the pharmacokinetics of an amphotericin B derivative].

Absorption, distribution and excretion of a new water soluble derivative of amphotericin B (NWSDA) were studied after its administration by different routes. After the antibiotic intravenous administration the therapeutic concentrations in blood, organs and urine were shown to remain for prolonged periods. The likely sites of NWSDA deposition were detected with microbiological and radionuclide methods. The most prolonged periods of antibiotic preservation were stated in the renal cortex, spleen and lungs. The ways of NWSDA excretion were studied in operated animals. Only 3.5 per cent of the antibiotic was excreted with urine and bile for 24 hours. The pharmacokinetic parameters of NWSDA after its intravenous administration were estimated. The bioavailability of the antibiotic after its intramuscular and oral administration was found to be low.