People who have ADHD typically are highly impulsive and do not react normally in many social situations. They also, typically, have a problem in communication. Now there are those who do have ADHD and have none of these problems, but genearally, people with ADHD have these problems. Taking the meds help them to not be so impulsive and it helps them slow down and it gives them a chance to think before they open their mouths. I speak from experience.
There are some kids for whom meds would be unwise, and some for whom they are necessary (and some, such as my oldest, who fall in both categories at different times in their development).
However, it is just about never better for a child to have divorced and separated parents than an intact family. (I don’t deny that divorce might be the best option when the parents can’t or won’t live together peacefully, but I don’t count that situation as “intact”, regardless of which of them are to blame).