Signs and symptoms of Concerta overdosage may include the following:

• Vomiting
• Agitation
• Muscle twitching
• Convulsion
• Grand mal convulsion
• Confusional state
• Hallucinations (auditory and/or visual)
• Headache
• Palpitations
• Heart rate increased
• Sinus arrhythmia
• Hypertension
• Dry mouth