If you use one drug to control your ADHD, be prepared to find an alternative. An Adderall shortage is causing problems for patients who depend on the drug. The nation's largest manufacturer, Teva Pharmaceuticals, blames a labor shortage earlier this year for disrupting the supply. The shortage, however, is also affecting companies that make other versions of the drug. Also, 64-percent of independent pharmacies can’t get the medicine. Teva says stock should be available soon.