My son suffers from ASD, there are many pros and cons for pharmaceutical solutions for ADD; Although I am not giving you medical advice (nor should any non-professional), I would suggest as a point of research looking into root causes of the condition, and a good starting point may be to check out one of the parent support resources for ASD. Here’s one that I have used to learn more about the ‘spectrum’:
http://www.talkaboutcuringautism.org/index.htm
Of course, the advice is not intended to supplant the recommendations of a medical professional, but as a concerned parent, it’s very informative. There are a lot of support groups online as well.
If the someone you are referring to is an adult, the same applies…good luck