The Canadian Psychiatric Association (CPA) here cites a number of meta-analyses which it recognizes as having “clearly demonstrated” the efficacy of cognitive-behavioral therapy (CBT) in alleviating anxiety symptoms. According to these Guidelines, the effectiveness of CBT in the treatment of anxiety symptoms in general is on par with that of antidepressant drug treatment. This appears to be the case in both individual and group therapy settings. For Generalized Anxiety Disorder (GAD) specifically, CBT is more effective than either placebo psychological treatment or no treatment at all.
Cognitive Behavioral Therapy
A Chicago Psychology Community Blog