https://medixway.com/adhd/adderall-15-mg/Generally Adderall 15mg Used For ADHD Treatment.The typical Adderall IR dosage for narcolepsy starts at 10 mg once daily. Your daily dose can be increased by 10 mg every week if needed. The maximum Adderall IR dosage for narcolepsy is usually 60 mg daily. You may need to divide your daily dose into two or three smaller doses taken throughout the day to effectively treat narcolepsy.