Here we report the activity of liposomes comprising egg phosphatidylcholine
(PC) and stearylamine (SA) against Leishmania donovani parasites. Both pro
mastigotes and intracellular amastigotes in vitro and in vivo were suscepti
ble to SA-PC liposomes. A single dose of 55 mg of SA-PC liposomes/animal co
uld significantly reduce the hepatic parasite burden by 85 and 68% against
recent and established experimental visceral leishmaniasis, respectively, s
uggesting their strong therapeutic potential.