A growing U.S. shortage of Adderall, a prescription drug taken to treat attention deficit hyperactivity disorder, has spread to two more makers of the drug. Lannett Co. and Par Pharmaceuticals are the most recent companies experiencing with limited supplies of generic extended-release Adderall, according to the University of Utah Pharmacy Services website, which tracks drug shortages nationwide. Adderall has often been in short supply over recent years. The most recent issue started with a labor shortage in August at Teva Pharmaceutical Industries Ltd., the nation’s leading seller of instant-release Adderall, Bloomberg reported. Demand for the drug is at an all-time high, Symphony Health told the outlet. Read more at the link in our bio.