This is the first time I have registered with a site to post on adhd. I felt compelled to do so here because I have the same problem as what is being discussed in this thread. It seems that my med (concerta) is completely inaffective during the first few days of my menstral cycle. It is very difficult to focus and to accomplish tasks.
There is defiantly something occuring hormonally. I would love to see this researched by medical professionals.