Combines two active ingredients, ivermectin and praziquantel, to provide the most comprehensive parasite control available for horses. Zimecterin Gold treats and controls the major species of equine parasites. Plus it is the first dewormer licensed in the US for the control of equine tapeworms. Does 1250 lbs of body weight. Has not been tested on foals under 5 months, pregnant mares or breeding stallions.