ZIMECTERIN Gold combines ivermectin, a leading ingredient that controls a wide variety of parasites, with praziquantel, an ingredient that specifically controls tapeworms. Together, they provide excellent equine parasite control. ZIMECTERIN Gold is approved to control more species and stages of equine parasites than any other brand, including benzimidazole-resistant small strongyles.It controls 47 species and stages of equine parasites in all. Plus, ZIMECTERIN Gold was the first dewormer approved by the FDA to effectively control tapeworms* with a single dose. Tapeworms have been recognized as a significant threat to the health of horses.