The World Wide Web is a constantly changing source of information, much of it of less than first rate quality.
One source of information on ADHD and the medication to treat it which is both reliable and extremely easy to use is:
Internet Mental Health created by Philip Long, M.D.
This Canadian site gives both U.S. and European definitions of syndromes and treatment strategies, making it particularly useful.
National Library of Medicine Files....PUBMED is a remarkable resource for any parent with a child
with special needs. This is the medical literature your doctor uses.
A powerful search tool for additional information is GOOGLE .