False about local anesthetics -
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
Prilocaine is less toxic than lignocaine
Lignocaine is used as an antiarrhythmic
Mixture of ligno +- prilocaine is known as eutectic
Lidocaine is shorter acting than bupivacaine