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% replaces any number of letters (la% - lake, lamp)_ replaces one letter (ca_ - car, cat)

Crossword clues for Adderall treats it 4 letters:

ADHD: Adderall treats it
ADHD: Problem Adderall treats
ADHD: What Adderall treats, for short
ADHD: Condition treated by Adderall, for short
ADHD: Condition treated with Adderall, in brief