<prompt> False about local anesthetics -Prilocaine is less toxic than lignocaineLignocaine is used as an antiarrhythmicMixture of ligno - prilocaine is known as eutecticLidocaine is shorter acting than bupivacaine  <response>: Ans. is a i.e., Prilocaine is less toxic than lignocaine o Prilocaine and Benzocaine can cause Methemoglobinemia. Therefore prilocaine is more toxic than lignocaine.o Lignocaine is also used as an antiarrhythmic.o A mixture of 2.5 lignocaine and 2.5 prilocaine is known as Eutectic Mixture of local anesthetics EMLA. This is unique topical preparation which can anesthetize intact skin.Local anestheticDuration of action without adrenalinewith adrenalineChloroprocaineLidocaineMepivacainePrilocaineBupivacaineRopivacaineDibucaine15-30 minutes45-60 minutes45 - 60 minutes45 - 60 minutes2-3 hours2-3 hours2.5- 3.5 hours30 - 90 minutes2 - 3 hours2 - 3 hours2 - 3 hours3 - 5 hours3-5 hours3.5 - 5.5 hours 