Quetiapine Augmentation for Primary Anxiety Disorder or Mood Disorders With Co-morbid Anxiety Symptoms

Inclusion criteria

• Provision of written informed consent
• A diagnosis of primary anxiety disorder or mood disorder with co-morbid anxiety symptoms by Diagnostic and Statistical Manual of Mental Disorders-Fourth Edition (DSM-IV)
• A 14-item Hamilton Anxiety Scale (HAM-A)>= 14
• Subject have received single antidepressant at a therapeutic dose for at least 6 weeks
• Male or female aged 18-65 years
• Female patients of childbearing potential must be using a reliable method of contraception and have a negative urine human chorionic gonadotropin (HCG) test at enrollment
• Able to understand and comply with the requirements of the study and sign informed consent

Exclusion criteria

• Pregnancy or lactation
• Any DSM-IV Axis I disorder not defined in the inclusion criteria.
• Receiving any anti-psychotic 7 days prior to entering the study
• Patients who, in the opinion of the investigator, post an imminent risk of suicide or a danger to self or others
• Known intolerance or lack of response to quetiapine fumarate, as judged by the investigator
• Use of any of the following cytochrome P450 3A4 inhibitors in the 14 days preceding enrollment including but not limited to: ketoconazole, itraconazole, fluconazole, erythromycin, clarithromycin, troleandomycin, indinavir, nelfinavir, ritonavir, fluvoxamine and saquinavir
• Use of any of the following cytochrome P450 3A4 inducers in the 14 days preceding enrollment including but not limited to: phenytoin, carbamazepine, barbiturates, rifampin, St.John's Wort, and glucocorticoids
• Administration of a depot antipsychotic injection within one dosing interval (for the depot) before randomization
• Substance or alcohol dependence at enrollment (except dependence in full remission, and except for caffeine or nicotine dependence), as defined by DSM-IV criteria
• Opiates, amphetamine, barbiturate, cocaine, cannabis, or hallucinogen abuse by DSM-IV criteria within 4 weeks prior to enrollment
• Medical conditions that would affect absorption, distribution, metabolism, or excretion of study treatment
• Unstable or inadequately treated medical illness (e.g. congestive heart failures, angina pectoris, hypertension) as judged by the investigator
• Involvement in the planning and conduct of the study
• Previous enrollment or randomization of treatment in the present study
• Participation in another drug trial within 4 weeks prior enrollment into this study or longer in accordance with local requirements
• A patient with Diabetes Mellitus (DM) fulfilling one of the following criteria:

• Unstable DM defined as enrollment glycosylated hemoglobin(HbA1c)> 8.5%
• Admitted to hospital for treatment of DM or DM related illness in past 12 weeks.
• Not under physician care for DM
• Physician responsible for patient's DM care has not indicated that patient's DM is controlled
• Physician responsible for patient's DM care has not approved patient's participation in the study
• Has not been on the same dose of oral hypoglycaemic drug(S) and/or diet for the 4 weeks prior to randomization. For thiazolidinediones(glitazones) this period should not be less than 8 weeks
• Taking insulin whose daily dose on one occasion in the past 4 weeks has been more than 10% above or below their mean dose in the preceding 4 weeks
• An absolute neutrophil count (ANC) of <= 1.5x10(9) per liter