Abstract
Suppression of Leishmania donovani liver amastigotes by sodium stibogluconate has been determined in a murine model of experimental visceral leishmaniasis. Niosomal and liposomal drug formulations were equiactive and both increased drug efficacy by an order of magnitude compared with that of free drug. Niosomes containing 30 mol % cholesterol were prepared from three different non-ionic surfactants and no significant difference in activity was detected among the different drug-loaded niosomes. Both negatively charged and neutral vesicles were found to be equally effective. However, vesicle cholesterol content had a slight influence on the antiparasitic activity of the drug-loaded niosomes. Empty vesicles produced a dose-dependent parasite suppression for all vesicles studied. Studies of antimony distribution in the mouse using neutron activation analysis showed high liver levels after i.v. administration of the carrier forms of the drug.
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