The gold standard is parasite control. Margin of saftey and is highly effective for protecting all horses including foals, breeding mares and 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.