Attention Deficit/Hyperactivity Disorder is often thought of as a childhood disorder that most outgrow. Reality is that many individuals deal with the impact of ADHD throughout life; some adults don't even recognize they have the condition until they find themselves unable to perform at work; they can't meet deadlines or keep work organized. Relationships are often impacted by ADHD as well, as individuals with attention problems are distracted and don't retain information others are counting on them to remember. They miss important events, they pay bills late and they seem insensitive to others for not keeping up with their family responsibilities.
You may have heard about the use of medication for individuals with ADHD and many do benefit from medication for this condition. In complementary fashion it is important for individuals with ADHD to learn strategies for leading their lives in a healthy, more productive fashion. Equally important is the understanding of those in an individual's life so apparently insensitive or irresponsible-looking behavior is put in context, allowing for relationships to improve as an individual learns to manage his/her life. Remember: medication doesn't make decisions, people do.