Abstract
Rates of personality disorders (PDs) in substance abusers are higher than in the general population. Comorbid PDs are believed to complicate the treatment of addicted patients: in addition to having more severe substance-use disorders and life problems, personality-disordered patients may use substances differently than their peers without Axis II diagnoses. In a sample of 339 adults receiving inpatient treatment for alcohol or drug abuse/dependence, 71.7% received Axis II diagnoses, and they presented a more severe clinical picture. They also had more self-reported “impulsive” substance use and use of drugs or alcohol in positive situations. Different groups of personality-disordered patients had different patterns of self-efficacy for abstinence for hypothetical future situations.