» Chlortetracycline and Sulfamethazine Bisulfates Soluble Powder is a dry mixture of Chlortetracycline Bisulfate and Sulfamethazine Bisulfate and one or more suitable buffers and diluents. It contains the equivalent of not less than 85.0 percent and not more than 125.0 percent of the labeled amounts of chlortetracycline hydrochloride (C₂₂H₂₄N₂O₈·HCl) and sulfamethazine (C₁₂H₁₄N₄O₂S).