Today's LD NewsThe New York TimesBetween the fall of 2011 and the spring of 2012, people across the United States suddenly found themselves unable to get their hands on A.D.H.D. medication. Low-dose generics were particularly in short supply. There were several factors contributing to the shortage, but the main cause was that supply was suddenly being outpaced by demand. The number of diagnoses of Attention Deficit Hyperactivity Disorder has ballooned over the past few decades.