Adderall is prescribed in various dosages, including 15 mg, which is often considered a standard starting dose for many patients. The effectiveness of this medication can be attributed to its ability to stimulate brain activity, thereby improving concentration and decreasing impulsivity in those with ADHD. Additionally, Adderall is utilized off-label for conditions such as depression and obesity; however, these uses should be approached with caution due to the potential for misuse and dependence.