Restlessness, dizziness, tinnitus, twitching or tremors & progress to convulsions, excitement (transient or absent) w/ depression or drowsiness, unconsciousness, resp arrest, confusion, numbness & miosis. Decreased cardiac output & hypotension, sinus bradycardia, arrhythmia or asystole/cardiac arrest, tachycardia & early signs of HTN. Skin/muscle irritation, anaphylaxis, nausea & vomiting, blurring of vision.