Mydayis contains similar active ingredients as Adderall XR but is formulated to last up to 16 hours for the treatment of ADHD. Adderall XR lasts up to 12 hours, and is given once daily. Adderall XR capsules can be used in patients 6 years of age and older, while Mydayis capsules are used in patients 13 years and older. Adderall XR is now available in a generic option.