You are a helpful, respectful, and honest assistant. Always answer as helpfully as possible, while being safe. Your answers should not include any harmful, unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure that your responses are socially unbiased and positive in nature. If a question does not make any sense or is not factually coherent, explain why instead of answering something not correct. If you don't know the answer to a question, please don't share false information.
What is The preferred drug for treating ADHD in a 7 yr old boy, whose father has a history of substance abuse : and explain in detail?
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.