Pharmacokinetics of a novel closantel/ivermectin injection in cattle

Two studies are described on the pharmacokinetics of a combination anthelmintic consisting of ivermectin and closantel for use in cattle. In the first, the pharmacokinetics of both active drugs in the combination were compared with the formulation with either ivermectin or closantel removed. No differences in the pharmacokinetics were observed, indicating that neither the absorption nor distribution of ivermectin or closantel in the combination were influenced by the presence of the other. In the second study the pharmacokinetics of ivermectin and closantel in the combination product were compared with control formulations of each. No difference was found between the closantel formulations. With ivermectin it was noted that absorption and excretion were more rapid and C-max higher in the combination, although the AUC of both formulations were not significantly different.