» Propoxycaine and Procaine Hydrochlorides and Norepinephrine Bitartrate Injection is a sterile solution of Propoxycaine Hydrochloride, Procaine Hydrochloride, and Norepinephrine Bitartrate in Water for Injection. It contains not less than 95.0 percent and not more than 105.0 percent of the labeled amount of propoxycaine hydrochloride (C₁₆H₂₆N₂O₃·HCl), not less than 95.0 percent and not more than 105.0 percent of the labeled amount of procaine hydrochloride (C₁₃H₂₀N₂O₂·HCl), and an amount of norepinephrine bitartrate (C₈H₁₁NO₃·C₄H₆O₆·H₂O) equivalent to not less than 90.0 percent and not more than 110.0 percent of the labeled amount of norepinephrine (C₈H₁₁NO₃).