I was given phentermine and i loved the energy and concentration it gave me for studying. is there something similar to take for a longer period.

Adult ADHD: is a common disorder, thought to be persistence of childhood attention deficit hyperactivity disorder (ADHD). It is characterized primarily by inner restlessness rather than hyperactivity; impatience; sensation seeking and excessive spending rather than impulsivity; inattention; and functional. Stimulant medications (methylphenidate, amphetamine derivatives) are presently first-line treatment.