当用作局部麻醉剂时，麻醉区血中利多卡因浓度是在1―2毫克／100毫升之间。
When used as a regional anaesthetic , lidocaine levels in blood from the anaesthetized areas are between 1 and 2 mg/100 ml.
局部麻醉剂比如如利多卡因都只能勉强有效，但会让皮肤过敏，因而最终让瘙痒变得更严重。
Topical anesthetics such as lidocaine are only marginally effective and can sensitize the skin-meaning the itching could ultimately get worse.
利多卡因一种合成氨化物，c14 h 22n2o，主要用它的盐酸盐作局部麻醉剂和抗。
A synthetic amide, C14H22N2O, used chiefly in the form of its hydrochloride as a local anesthetic and antiarrhythmic agent.
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