Janet and others concerned with cd, How about questions about the balance of dopamine, serotonin, and norepinephrine?? If you are missing one, do the others get out of balance and could this unbalancing be a cause of cd in pwp??? I wonder since so many of us take SRI's as well as dopamine (sinemet) what about the other one, norepinephrine?? How much is known about the balance of these hormones in the brain? Just another thought. Marling