Lidocaine is used as a pain killer, according to Drugs.com and WebMD. Lidocaine is either injected or delivered intravenously for local and regional pain relief. Lidocaine hydrochloride is also applied topically to reduce the itching associated with eczema, insect bites, minor burns and other injuries to the skin, says WebMD.
When lidocaine is applied topically, it is usually applied in a thin layer to the affected area of skin about two to three times a day or as recommended by the patient's physician, says WebMD. Pads impregnated with lidocaine are used once and then discarded. It is used as block anesthesia during childbirth and as a local or infiltration anesthesia during dental procedures, claims Drugs.com.