MEBENDAZOLE, A BENZIMIDAZOLE CARBAMATE DERIVATIVE, IS AN ANTHELMINTIC, ACTIVE AGAINST MOST NEMATODES AND SOME OTHER WORMS AND ALSO ACTIVE AGAINST SOME LARVAL STAGES AND OVA. ITS ANTHELMINTIC ACTIVITY IS CONSIDERED TO BE DEPENDENT ON THE INHIBITION OR DESTRUCTION OF CYTOPLASMIC MICROTUBULES IN THE WORMS INTESTINAL OR ABSORPTIVE CELLS.