Controls 47 species and stages of parasites. Each syringe treats up to 1,250 lbs body wt. Approved for foals 2 months of age older Zimecterin Gold Paste horse wormer from Merial contains 1.55 percent ivermectin and 7.75 percent 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.