The benefits of a longer course of cognitive behavioral therapy for some patients with social anxiety disorder.

Historically, cognitive behavioral therapy (CBT) for social anxiety disorder (SAD) has been evaluated in randomized-controlled trials as a 12-16 session treatment and has demonstrated response rates ranging from 58% to 75%. Despite these promising results, some patients do not improve substantially after this short course of CBT. It is unclear whether non-responding patients would make substantial improvements in social anxiety with further treatment. In a university outpatient clinic specializing in CBT for SAD, we compared outcomes for patients who ended treatment after approximately 20 sessions of CBT (= 38) to those who continued treatment for a variable number of additional sessions (= 34). We found no between-group differences in demographic characteristics, number of comorbid diagnoses, comorbid generalized anxiety disorder or major depressive disorder, or severity of depression at baseline. Patients who ended treatment after 20 sessions experienced greater improvements in SAD over those 20 sessions compared to those who continued treatment. Both groups experienced changes in depression and quality of life over the first 20 sessions. Those who continued treatment showed additional decreases in social anxiety beyond session 20. For those who initially appear to be non-responsive to CBT for SAD, a longer course of treatment may elicit significant improvements.