Lidocaine is a common local anesthetic and class 1b antiarrhythmic drug. Lidocaine is used topically to relieve itching, burning and pain from skin inflammations, injected as a dental anesthetic or as a local anesthetic for minor surgery. It is on the world health organization's list of essential medicines, a list of the most important medications needed in a basic healthcare systemsynonyms lidocaine (inn) ; xylocaine; lignocaine; n-(2, 6-dimethylphenyl)-n2, n2-diethylglycinamideiupac 2-(diethylamino)- n-(2, 6-dimethylphenyl)acetamideformula c14h22n2omolecular weight 234.34 gmolcas 137-58-6; 73-78-9 (hcl)appearance nopurity 99 %