 Nootropics, also commonly referred to as "smart drugs", are drugs that are claimed to improve human cognitive abilities.Nootropics are used to improve memory, concentration, thought, mood, and learning.An increasingly used nootropic among students, also known as a "study drug", is methylphenidate branded commonly as "Ritalin" and used for the treatment of attention deficit hyperactivity disorder (ADHD) and narcolepsy.