Symptoms of overdose can be similar to the medication’s side effects, but are usually more severe. Patients exhibiting any of these symptoms while taking stimulants should contact their physician immediately:

• Agitation
• Confusion
• Delirium
• Dry mouth
• Euphoria
• Fever
• Flushing
• Headache
• Hallucinations
• Heart palpitations
• Nausea and vomiting
• Seizures

Symptoms of overdose with antidepressants used to treat ADHD include:

• Ataxia (disorder that affects many tissues and body systems)
• Seizures

Symptoms of overdose associated with alpha-2 adrenergic agonists used to treat ADHD include:

• Hypotension (low blood pressure)
• Breathing difficultes
• Hypothermia (low body temperature)
• Apnea (cessation of breathing)
• Seizures
• Lethargy
• Agitation
• Irritability
• Diarrhea
• Slow heartbeat
• Unusual tiredness or weakness