lidocaine hcl api is a widely used intermediate-acting amide local anesthetic. Because of its fat solubility and protein binding rate are higher than that of procaine, and its ability to penetrate cells is stronger, it has a faster onset and action time than procaine. Long, the strength of action is 4 times that of procaine. lidocaine hcl api has an effective rate of over 80% against tachycardia caused by various causes and is relatively safe. Therefore, lidocaine can be used as the drug of choice for acute ventricular arrhythmia caused by various etiologies.