<prompt> True about local anaesthetic a Cocaine acts by decreasing norepinephrineb Act by decreasing sodium entry into cellc Lignocaine is an amided Dibucaine is drug of choice for epidural anaesthesiaacacbc  <response>: Local anesthetics prevent influx of Na by inhibiting Na channel.Lignocaine Lidocaine is an amide.Dibucaine is not used for epidural anesthesia. Lidocaine and bupivacaine are the most commonly used local anesthetics for spinal and epidural anesthesia. 