Attention Disorders ~ ADD

This is a discussion regarding Attention Disorders. Please post any question you may have and hopefully someone will be able to answer. Here is my question:
What are the pro's and con's to putting children on medication for ADD?
What are the pro's and con's to starting ADD medicine as an Adult?
Is the United States the only place that really treats ADD in such large numbers?
Just curious. If you have thoughts, please share.
Thanks!