Bulimia nervosa (BN) is a common eating disorder that is characterized by periods of bingeing and purging. People with the dysregulated subtype of BN experience behavioral impulsivity; disruption of cognitive, affective, behavioral, and neurophysiological processes (dysregulation); interpersonal dysfunction; and poor treatment response. To date, no therapies have been tested for this specific population, and it is unknown whether therapy that directly focuses on treating BN symptoms or one that addresses both eating and personality disorder symptoms is more effective. Cognitive behavioral therapy (CBT), which concentrates on modifying patients' behaviors and ways of thinking, has been effective in treating BN. This study will compare the effectiveness of two types of CBT, focused and broad, in treating adult women with the dysregulated subtype of BN.