I had a co-worker that was a ritalin kid. When he first moved in the area with his wife, he was busy fixing up the house, doing yardwork, and setting up the garage (separate building from house) as a workshop/ guy time hangout. When all the major work was finished and he became comfortable at work, he started working out at the local gym. When his wife had their first kid, she wanted him around the house more, and that's when the drinking started. He would be bouncing off the walls, and resorted to drinking and spending all his time with drinking buddies in his garage. Then the coke usage kicked in, then he started sleeping around. I found out from his wife's cousin this was a pattern and they moved close to her family in the middle of nowhere to escape his old habits.
The bottom line: when he was busy, he was fine. When things slowed down or had to cut back because of family obligations/ lack of funds, he resorted to drugs. I work with others that have been diagnosed with ADD and didn't do drugs, and they tend to be very creative and self motivational, and are more likely to be self employed or very autonomous. I can understand how a parent would be concerned when they hear their kid has a learning problem, but I would rather see alternatives first than putting the kid on drugs right away.