» Lypressin Nasal Solution is a solution, in a suitable diluent, of the polypeptide hormone, prepared synthetically and free from foreign proteins, which has the properties of causing the contraction of vascular and other smooth muscle and of producing antidiuresis, and which is present in the posterior lobe of the pituitary of healthy pigs. It contains suitable preservatives, and is packaged in a form suitable for nasal administration so that the required dosage can be controlled as required. Each mL of Lypressin Nasal Solution possesses a pressor activity of not less than 85.0 percent and not more than 120.0 percent of that stated on the label in USP Posterior Pituitary Units.