» Cefmetazole Injection is a sterile isoosmotic solution of Cefmetazole and Sodium Citrate in Water for Injection. It contains one or more buffer substances and a tonicity-adjusting agent. It contains not less than 90.0 percent and not more than 120.0 percent of the labeled amount of cefmetazole (C₁₅H₁₇N₇O₅S₃).