“…Bupivacaine or Marcaine (1-n-butyl-dl-piperidine-2-carboxylic acid-2, 6dimethylanilide hydrochloride) is a long-acting anaesthetic agent closely related chemically to mepivacaine or Carbocaine (l-n-methyl-dl-piperidine-Zcarboxylic acid-2, 6-dimethylanilide hydrochloride). In PCB (Saloheimo, 1967;Stockhausen, 1967;Cooper et al, 1968), as well as in other nerve blockades (Telivuo, 1963;HollmBn, 1966;Duthie et al, 1968), a considerably longer duration of action has been found after a single injection with bupivacaine compared with the duration of anaesthesia with lignocaine, mepivacaine and prilocaine.…”