5. Each subject already taking medicine must be taking usually effective doses of a medicine demonstrated to be effective in childhood OCD, must have been stable on that dose for at least six weeks, and must have no newly recognized or intolerable adverse effects from that medicine. Subjects who are currently not taking such a medication must have had adequate trial in the past of at least one medicine that has been shown to be effective for the symptoms of childhood OCD, and must have failed to see improvement or must have had intolerable adverse effects from the medicine.