The preferred drug for treating ADHD in a 7 yr old boy, whose father has a history of substance abuse :
Methylphenidate is a stimulant used as DOC for ADHD, but stimulants are contraindicated in patient with family history of substance abuse. Therefore non stimulants are used and Atomoxetine is preferred over Clonidine.
Methylphenidate
Atomoxetine
Clonidine
Dexamphetamine