Hi, My Grandson Is Taking Adderall By Prescription From His

Hi, My grandson is taking Adderall by prescription from his Dr. for a few years now. He is 21 & just finished EMT school & Fire Academy. He will be taking physical exams for a job as a Firefighter. Will taking this prescription hurt his chances for passing the physical? He is not on any other drugs & is a fine young man. He has to take this for his ADHD. Thank You.