ADHD stands for attention deficit hyperactivity disorder, a condition with symptoms such as inattentiveness, impulsivity, and hyperactivity. The symptoms differ from person to person. Buy ADHD Medications online without Prescription OnlineDrugs24.com. ADHD was formerly called ADD, or attention deficit disorder. Both children and adults can have ADHD, but the symptoms always begin in childhood. Adults with ADHD may have trouble managing time, being organized, setting goals, and holding down a job.