The local anesthesia potency and duration of lidocaine are stronger than that of procaine, but the toxicity is also greater. The deethyl metabolite (monoethyl glycinamide xylene) metabolized in the liver still has local anesthetic properties, but its toxicity is increased, and it is further degraded by amidase and excreted in urine, and 10% of the dosage is excreted in its original form,lidocaine api manufacturers,