There may be a problem with how a person develops their information processing skills. However, as with most mental disorders, not knowing the cause does not mean we do not know what works in treatment. And what works in treatment for OCD are certain psychopharmacological agents and behavior or cognitive-behavior psychotherapy. Large studies have shown that more than three-quarters of patients are helped by these medications at least a little. And in more than half of patients, medications relieve symptoms of OCD by diminishing the frequency and intensity of the obsessions and compulsions.
Improvement usually takes at least three weeks or longer.
If a patient does not respond well to one of these medications, or has unacceptable side effects, another SRI may give a better response. Medications are of help in controlling the symptoms of OCD, but often, if the medication is discontinued, relapse will follow. Indeed, even after symptoms have subsided, most people will need to continue with medication indefinitely, perhaps with a lowered dosage. For the treatment to be successful, it is important that the therapist be fully trained to provide this specific form of therapy. It is also helpful for the patient to be highly motivated and have a positive, determined attitude.