Over the past decade, two epidemics have had a severe impact on public
health in this country. These health problems involve cocaine abuse a
nd AIDS (or HIV disease). The processes of these two conditions are cl
early not independent of each other and may be quite complex. Understa
nding of this relationship has been hampered by a myriad of social, bi
ological and behavioral variables that are entangled with the basic co
caine-HIV association. This article presents a paradigm for discussion
of the interaction between cocaine exposure and HIV disease based on
three mechanisms: the relationship between cocaine exposure and increa
sed opportunity for HIV exposure, the direct role that cocaine plays i
n altering susceptibility to HIV infection, and the influence that coc
aine use has on the progression of HIV disease. The goal of this struc
tured approach is to enhance conceptual understanding of the cocaine-H
IV relationship while recognizing the complexity of the issue and the
limitations of current research efforts. This model will serve as a fr
amework for the discussion of implications for future research, clinic
al practice, and public policy.