ANAESTHETIC PRODUCTS ARE CATEGORISED INTO TWO CLASSES, NAMELY GENERAL ANAESTHETICS, WHICH CAUSE A REVERSIBLE LOSS OF CONSCIOUSNESS; AND LOCAL ANAESTHETICS, WHICH CAUSE A REVERSIBLE LOSS OF SENSATION LOCALLY (E.G. FOR LOCAL SURGICAL PROCEDURES) OR FOR A LIMITED REGION OF THE BODY SUCH AS EPIDURAL ANAESTHESIA, WHILE MAINTAINING CONSCIOUSNESS.