Elanco Cydectin Pour-On is a ready-to-use topical treatment for cattle that controls roundworms, lungworms, grubs, lice, and mites while providing seven days of persistent protection against horn flies. It requires no milk or slaughter withdrawal and is not for use in veal calves. The product is applied at 1 ml per 22 pounds of body weight along the top of the back from the withers to the tail head, with a convenient dosage chamber ensuring the correct rate. Its efficacy is not affected by rainfall, making it reliable in all weather conditions.