Green’s Dictionary of Slang

(US drugs) Adderall, used to counter ADHD.

2006		Urban Dict. 🌐 addy College slang for the ADHD medication and wonder study-drug, Adderall. Simply put, Adderall is speed.
2012		Philadelphia Inquirer 16 Nov. 🌐 They're known as study drugs ... party drugs ... vitamin R, the smart drug, addy, a-bomb [...] they’re actually stimulants like ‘Ritalin’ and ‘Adderall’, which are commonly prescribed to treat attention deficit hyperactivity disorder (ADHD).
2018		USA Today 10 Aug. 🌐 “Addy is slang for Adderall,” my 20-year old neighbor Morgan Austin tells me. Adderall is a prescription drug for ADHD but also is abused as a popular recreational drug among teens.