How do you know when someone has had too much lidocaine and what should be done when that happens?

Toxicity: There are recommended maximal doses of Lidocaine based on body weight, location of injection, and whether or not it is combined with epinephrine. Toxicity or "too much" can be indicated by ringing in the ears, tingling in the tongue, sedation, confusion , agitation, arrhythmia, seizures, bradycardia, apnea. Stopping administration is first. Supporting the body functions acls is next.