Combination of Paroxetine CR and Quetiapine for the Treatment of Refractory Generalized Anxiety Disorder
The purpose of this study is to examine the safety and efficacy of quetiapine for generalized anxiety disorder patients who remain symptomatic despite treatment with paroxetine CR.
|Study Design:||Allocation: Randomized
Endpoint Classification: Efficacy Study
Intervention Model: Parallel Assignment
Primary Purpose: Treatment
|Official Title:||Combination of Paroxetine CR and Quetiapine for the Treatment of Refractory Generalized Anxiety Disorder|
- Symptoms of generalized anxiety disorder
- Clinical global improvement
|Study Start Date:||February 2004|
|Study Completion Date:||November 2007|
Generalized anxiety disorder (GAD) is a relatively common condition affecting 5% of the population, with a typically chronic course and associated with significant psychosocial impairment and decreased quality of life (Schweizer, 1995). Although a number of therapeutic agents demonstrate some efficacy in the treatment of generalized anxiety disorder, only a minority of anxious patients experience remission with initial treatment.
The purpose of this study is to examine the efficacy of one strategy, the addition of quetiapine, for the treatment of patients with GAD who remain refractory despite an adequate treatment trial with a selective serotonin reuptake inhibitor (SSRI). Quetiapine is a novel antipsychotic agent with potent effects at the serotonergic, as well as dopaminergic receptor, and a more favorable side effect profile than standard neuroleptics, including a low potential to cause extrapyramidal symptoms.
This is a two phase, 18-week research study in which participants who remain symptomatic at the end of one phase (10 weeks) enter into the next phase. In phase I, all participants receive paroxetine CR (Paxil CR) for 10 weeks. Participants who continue to have anxiety symptoms will enter the 8-week Phase II, in which they continue taking Paxil CR and they will also be randomly assigned (by chance, like a flip of a coin) to receive quetiapine (Seroquel) or placebo (contains no active medication).
|United States, Massachusetts|
|Massachusetts General Hospital|
|Boston, Massachusetts, United States, 02114|
|United States, North Carolina|
|Duke University Medical Center|
|Durham, North Carolina, United States, 27710|
|Principal Investigator:||Naomi M Simon, MD||Massachusetts General Hospital|
|Principal Investigator:||Kathryn Connors, MD||Duke University|