Zimecterin Gold Paste horse wormer from Merial contains 1.55% ivermectin and 7.75% praziquantel. For use in foals, mares, ponies and breeding stallions for the treatment and control of tapeworms, large and small strongyles, pinworms, ascarids, hairworms, stomach bots, lungworms and threadworms. Each 1 dose syringe of Zimectrin Gold treats up to 1,250 lbs body weight. 6 pack is convenient for dosing multiple horses. 100% satisfaction guaranteed.