Raised plasma conc. Restlessness, excitement, nervousness, dizziness, tinnitus, blurred vision, nausea & vomiting, muscle twitching, tremors & convulsions. Tongue & perioral region numbness. Transient excitation, depression w/ drowsiness, resp failure & coma. Myocardial depression & peripheral vasodilation resulting in hypotension & bradycardia, arrhythmias & cardiac arrest. Methaemoglobinaemia. Fetal intoxication. Maternal hypotension. Allergic reactions eg, cutaneous lesions, urticaria, oedema.