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Lidocaine Injection is a sterile, non-pyrogenic, aqueous solution which contains Lidocaine Hydrochloride. It is a local anaesthetic of the amide type and has a fast onset and an intermediate duration of action. The onset of action ranges from 5 minutes for infiltration anaesthesia to 20 minutes for regional anaesthesia. The duration of action is approximately one hour. Lidocaine stabilizes the neuronal membrane by inhibiting the ionic fluxes required for the initiation and conduction of impulses, thereby effecting local anaesthetic action.
Pharmacology
Lidocaine acts mainly by inhibiting sodium influx through sodium specific ion channels in the neuronal cell membrane, in particular the so called voltage-gated sodium channels. When the influx of sodium is interrupted, an action potential cannot arise and signal conduction is inhibited. The receptor site is thought to be located at the cytoplasmic (inner) portion of the sodium channel. Lidocaine binds more readily to sodium channels in activated state, thus onset of neuronal blockade is faster in neurons that are rapidly firing. This is referred to as state dependent blockade.