The present study describes the relationship between depression and se
veral measures of social functioning - including employment, criminal
activity, incarceration, marital functioning, and alcohol and drug use
- in a population of adult drug abusers. Our investigation extends pa
st work in this area by specifically investigating the effects of depr
ession (as opposed to simple substance use) on social and interpersona
l functioning. Predictably, elevated levels of depression were associa
ted with increased use of hard drugs and alcohol, greater levels of in
stitutionalization, reduced attendance at work or school, and lower ov
erall rates of marital satisfaction. Consistent with previous reports,
level of marijuana use was not related to severity of depression. It
appears that depressed substance abusers experience significantly more
social, vocational, and interpersonal dysfunction than their nondepre
ssed counterparts. It is proposed that the efficacy of existing treatm
ent programs for adult drug abusers will be enhanced through the addit
ion of strategies to assess and ameliorate depression.