Amphetamine / dextroamphetamine
"I recently was diagnosed with ADHD and was started on 20 mg. The first day  I took it I felt great! I was energized and motivated. I did have trouble sleeping but that ended after the first week. I will warn you about the side effects because those hit me pretty hard. I had headaches daily, fast heart rate, dizziness, and blurry vision. That lasted about 2 weeks and eventually passed although I still had the fast heart rate. It decreased my appetite because I was no longer snacking and was getting full a lot faster. After about 3 weeks I noticed that the "good feeling" was gone and I felt a crash throughout the day like I had no energy.  My doctor just prescribed me 30mg and I'm on day 3."