A 10-Week Study Evaluating the Efficacy And Safety of PD 0332334 for the Treatment of Generalized Anxiety Disorder

Inclusion Criteria: * Diagnosis of GAD (Diagnostic and Statistical Manual-IV \[DSM-IV\], 300.02) as established by the clinician (psychiatrist or licensed clinical psychologist) who has interviewed the subject using all sources of data including the Mini International Neuropsychiatric Interview (MINI) for DSM-IV Axis I disorders and other clinical information. Subjects with specific phobia(s) (as defined in DSM-IV) or dysthymic disorder will be allowed in the study. * Subjects must have a HAM-A total score ≥20 at the screening (V1) and randomization (V2) visits. Subjects must also have a Covi Anxiety Scale score of \>9 and a Raskin Depression Scale score \<7 at the Screening (V1) visit to ensure predominance of anxiety symptoms over depression symptoms. Exclusion Criteria: * Subjects with evidence or history of clinically significant hematological, renal, endocrine, pulmonary, gastrointestinal, cardiovascular, hepatic, pancreatic, neurologic, active infections, immunological, or allergic disease (including drug allergies). * Any of the following current (within the past 6 months through the present) DSM-IV Axis I diagnoses: Major depressive disorder, Obsessive compulsive disorder, Panic disorder; Agoraphobia, Posttraumatic stress disorder, Anorexia, Bulimia, Caffeine-induced anxiety disorder, Alcohol or substance abuse or dependence unless in full remission for at least 6 months, Social anxiety disorder. * Any of the following past or current DSM IV Axis I diagnoses: Schizophrenia, Psychotic disorder, Delirium, dementia, amnestic, and other clinically significant cognitive disorders, Bipolar or schizoaffective disorder, Cyclothymic disorder, Dissociative disorders. * Antisocial or borderline personality disorder. * Serious suicidal risk per the clinical investigator's judgment.