Study Of Generalized Anxiety Disorder

Inclusion Criteria: * Diagnosis of Generalized Anxiety Disorder (GAD) according to Diagnostic and Statistical Manual of Mental Disorders, Fourth Edition (DSM-IV) criteria. * Must give a written informed consent. But if the patient is under 20, both the patient himself/herself and his/her proxy consenter must give written informed consent. Exclusion Criteria: * Have the following conditions currently or diagnosed in the past 24 weeks: Major Depressive Episode, Panic Disorder Without Agoraphobia, Panic Disorder With Agoraphobia, Social phobia/social anxiety disorder (SAD), Agoraphobia Without History of Panic Disorder, Posttraumatic Stress Disorder, Obsessive Compulsive Disorder, Anorexia Nervosa, Bulimia Nervosa, Dysthymic disorder * Current or history of schizophrenia, bipolar disorder or cyclothymic disorder. * Psychotherapy or cognitive behavioral therapy other than supportive psychotherapy. * Current or history of substance abuse (alcohol or drugs) or substance in past 24 weeks. * Taken St. John's Wort in past 4 weeks. * Had electroconvulsive therapy (ECT) in past 12 weeks. * Had psychotherapy or cognitive behavioral therapy other than supportive psychotherapy within 24 weeks. * Women who are pregnant or lactating, who may be pregnant, or who plan for pregnancy by 30 days after the completion of final dose. * Pose a suicidal threat or have attempted suicide in past 24 weeks. * History of convulsive disorder (epilepsy, etc.). * Significant unstable medical illness. * Current or history of glaucoma. * History or complication of cancer or malignant tumor. * History of hypersensitivity to paroxetine.