I am 20 years old, and was just diagnosed with ADHD. My doctor prescribed me 20mg Adderall IR twice a day. The first few days were really good. I had a lot of energy, and was really focused. After the third day I started to feel really tired, drowsy, and irritated with everything. I'm not too sure whats going on. If this is the right medication for me, my dose is too high, or it's wearing off to soon.