The purpose of the study is to investigate the functional state of dopamine cells and the
dopamine transporter in ADHD subjects and controls to assess the effects of chronic
methylphenidate treatment on dopamine cell function and dopamine transporter levels in ADHD
- Must give informed consent
- Must be between the ages of 18 and 45 years old.
- Must have a confirmed diagnosis of ADHD
- Must have scored on a rating scale that indicate a significant level of symptom
- Must have a childhood history of ADHD must be documented using established test
- Must have had no previous medication treatment for ADHD except for a short term
treatment period of less than three months, which should have occurred at least six
months prior to the study.
- Must have an interest in receiving long-term medication treatment for ADHD.
- Must not test positive for psychoactive drugs during a urine drug screen.
- Must not be pregnant.
- Must not be breastfeeding.
- Must have no past or present history of dependence on alcohol or other drugs of abuse
except nicotine or caffeine.
- Must have no past or present history of a psychiatric disorder except ADHD.
- Must have no medical illness that may affect brain function.
- Must not have taken medication that may affect brain function.
- Must not have had head trauma with loss of consciousness (> 30 minutes).
- Must not have significant anxiety or depression as determined by an established test.
- Must have no history of a significant learning disability.
- Must have no history of cardiovascular or endocrinological disease.
- Must have no history of coagulation disorder.
- Must have no history of sensitivity to lidocaine and/or prilocaine.
- Must have no history of claustrophobia.
- Contraindication to MRI environment (presence of any implanted metallic objects such
as cardiac/neural pacemakers, defibrillators, aneurysm clips, certain heart valves,
spinal nerve stimulators, artificial joints/limbs, shrapnel/bullets, metal fragments
in their eyes, cochlear implants, hearing aids, dental implants).
- Must have no history of glaucoma.