ADHD is characterized by a lack of ability to focus and concentrate, and most children diagnosed with the condition end up being prescribed a medication. A new study offers a warning to parents, however: one of the most popular ADHD meds, Methylphenidate (MPH), may be affecting the development of white matter in children's brains. The drug does not appear to have the same neurological effects in adults.

According to the CDC, roughly 5.2% of all American children between the ages of 2 and 17 are currently taking ADHD medication. Many of those children will continue to take these medications, everyday, well into adulthood.