Novolin N is an intermediate acting insulin called insulin isophane, and is human made hormone. It works to lower blood sugar levels in the treatment of diabetes. Novolin N acts different for regular insulin, because it is designed to start taking effect 2 to 4 hours after injection, peak at 4 to 12 hours, and then keep working for 12 to 18 hours. If your pet has been diagnosed with diabetes, your veterinarian may prescribe a type of insulin like Novolin N. Available in 10 mL bottle.