Combination Therapy with Indolylquinoline Derivative and Sodium Antimony Gluconate Cures Established Visceral Leishmaniasis in Hamsters

2-(2″-Dichloroacetamidobenzyl)-3-(3′-indolylquinoline), designated indolylquinoline derivative A, reduced the splenic and the liver parasite burdens by >93.0% in Leishmania donovani-infected hamsters, whereas sodium antimony gluconate (SAG) reduced the burdens approximately 80.0%. Complete clearance of parasitemia from the livers and spleens was noticed when infected animals received indolylquinoline derivative A plus SAG, suggesting that indolylquinoline derivative A has potential as a new agent for sole or conjunctive therapy for leishmaniasis.