benzocaine hydrochloride is the hydrochloride form of the local anesthetic benzocaine. Its pharmacological action is the same as that of benzocaine, but its anesthetic effect is weaker than that of procaine. Topical absorption is slow and the effect is long-lasting. Because it is insoluble in water, it cannot be used for anesthesia infiltration. It has analgesic and antipruritic properties. benzocaine hydrochloride Stable in air. Using p-nitrotoluene as a raw material, in sulfuric acid, it is oxidized with sodium dichromate to generate p-nitrobenzoic acid, which is esterified with ethanol. After the reaction is completed, it is separated. In the solution, reduce with iron powder at 85-95 ℃ to obtain crude benzocaine. After separation, it was washed with water and purified by recrystallization from ethanol.