Buy Tetracaine hcl online. Tetracaine, also known as amethocaine, is an ester local anesthetic used to numb the eyes, nose, or throat.[2] It may also be applied to the skin before starting an intravenous (injection) to decrease pain from the procedure.[3] Typically it is applied as a liquid to the area.[2] Onset of effects when used in the eyes is within 30 seconds…