This is not true. Though the hyperactivity may lessen as a component for most individuals, impulsivity, distractibility, and short attention span remain into adulthood. These adults' lives are often cluttered with missed appointments, lost items, anger, and lack of stability in employment, as well as financial difficulties. More serious problems are often present such as substance abuse and frequent traffic violations. A major difficulty is that this reads like a list of irresponsible behaviors, and we think of these behaviors as willful activities.
Medication can be a helpful part of the treatment and ought to be explored.
Different medications, different doses, and different administration schedules are worth experimenting with until the most effective combination is found. But medication, if used, is only a part of the treatment. Another important component of treatment is providing structure. To help understand this, we can frame it in the following manner. We would never think of taking our children to school, dropping them off, and leaving them to spend six to eight hours in an unstructured setting.