Text Messaging Adherence to Stimulant Medication

Inclusion Criteria: * Male or female children ages 6-17 years * A diagnosis of ADHD (inattentive, hyperactive/impulsive, or combined type) according to the Diagnostic and Statistical Manual of Mental Disorders, Fourth Edition (DSM-IV) based on clinical assessment and supported by a Clinical Global Impression- ADHD (CGI-ADHD) Severity Score of at least 4 (Moderately Ill) * Has a parent in possession of a cellular phone with text messaging capabilities and is interested in and willing to receive planned text messages * Has never been treated with stimulant medication, or has begun treatment with stimulant medication within three months of study enrollment. Exclusion Criteria: * Any serious, unstable, chronic medical condition, per clinician assessment * Cardiovascular disease * Current or past history of seizures * Treatment with stimulant medication beyond three months prior to enrollment * Pregnant or nursing females * Investigator and his/her immediate family; defined as the investigator's spouse, parent, child, grandparent, or grandchild * Unstable psychiatric illness other than ADHD, including, but not limited to: Autism, Bipolar Disorder, Psychosis, Major Depressive Disorder, Anorexia, Bulimia, Post-Traumatic Stress Disorder and Anxiety Disorders * History of multiple adverse drug reactions * Presence of suicidal risk, or homicidality * Unwilling/unable to comply with study procedures * Poor command of the English language