Generic versions of the Takeda’s (NYSE:TAK) ADHD drug Adderall (amphetamine and dextroamphetamine) continue to be in short supply as demand for it has surged. Both instant-release and extended-release versions of mixed amphetamine salts have been affected by the shortages. A central supplier of the drug in the U.S., Teva (NYSE:TEVA), says labor shortages related to packaging…