
OCD occurs in two to five percent of the population, and is the fourth most common psychiatric diagnosis. The majority of OCD patients who have not experienced symptom relief may have not received adequate trials of appropriate medication and/or behavioral therapy. The remainder typically do not respond because of poor treatment compliance, unrecognized cognitive impairment, co-occuring psychiatric illness or poor understanding of treatment. Adequate treatment for OCD often requires that medication trials be longer than those for other psychiatric illnesses. Additionally, while behavioral interventions are time- and labor intensive, frequently requiring close supervision and support.