Panic disorder (PD) in adolescents is a prevalent and chronic anxiety disorder. People with PD experience unexpected attacks of fear, along with elevated heart rate, dizziness, faintness, weakness, and increased sweating. During these panic attacks, people may feel numbness in their hands, flushed or chilled, nauseous, or pain in the chest, and they may lose touch with reality. PD can lead to substantial social impairment for adolescents, including avoidance of school, independent activities, and peer involvement. When PD progresses so far that a person avoids public places where a panic attack might occur, the person is said to have a condition known as agoraphobia. Weekly sessions of cognitive behavioral therapy (CBT) appear to be effective in treating panic disorder with agoraphobia (PDA). However, many adolescents with PDA and their families report the need for a more immediate relief from the disorder. This study will evaluate the effectiveness of intensive CBT in treating adolescents with PDA.