tetracaine powder Role: Local anesthetics. tetracaine powder Local anesthetic intensity: tetracaine>tetracaine hcl>lidocaine>lidcaine hcl> benzocaine > procaine>procaine hcl Local anesthesia is 10 times stronger than procaine, the effect can be maintained for 2 ~ 3h, with strong penetrating power. tetracaine powder Mainly used for surface anesthesia of the eyes, nose, throat and urinary tract. It can cause convulsions after absorption, and then it is converted to respiratory depression, and is generally not used for anesthesia such as infiltration and