Dose-Dependent Effects of Lidocaine
| | Plasma Lidocaine Concentration (μg/mL) | Effect |  | 1-5 | Analgesia |  | 5-10 | Circumoral numbness |  | Tinnitus |  | Skeletal muscle twitching |  | Systemic hypotension |  | Myocardial depression |  | 10-15 | Seizures |  | Unconsciousness |  | 15-25 | Apnea |  | Coma |  | >25 | Cardiovascular depression | 
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