<unk>  is a Psycostimulant that is FDA approved for the treatment of ADHD. There is a Black Box Warning for this drug as shown here.  Common adverse reactions include dyspepsia, decreased appetite, headache,anxiety.
Dexmethylphenidate
Methylphenidate 
Atomoxetine
Guanfacine
Pirfenidone
Norfluoxetine
Fluoxetine
Modafinil