In the event of overdosage, emergency treatment should be started immediately. Other signs and symptoms may be euphoria , excitement, tachycardia, palpitations, thirst, perspiration , nausea , dizziness , tinnitus , ataxia, blurred vision, and hypertension or hypotension. In large doses sympathomimetics may give rise to giddiness, headache, nausea, vomiting , sweating, thirst, tachycardia , precordial pain , palpitations, difficulty in micturition , muscular weakness and tenseness, anxiety , restlessness, and insomnia.
Many patients can present a toxic psychosis with delusions and hallucinations.
Some may develop cardiac arrhythmias, circulatory collapse, convulsions, coma , and respiratory failure. The patient should be induced to vomit, even if emesis has occurred spontaneously. Pharmacologically induced vomiting by the administration of ipecac syrup is a preferred method. However, vomiting should not be induced in patients with impaired consciousness. The action of ipecac is facilitated by physical activity and by the administration of eight to twelve fluid ounces of water.