Alcohol, marijuana, cocaine use, and relationship quality among HIV serodiscordant male couples.

The association between substance use and relationship quality was explored in a sample of 117 serodiscordant male couples. Several measures of relationship quality were used including dyadic satisfaction, affection, commitment, sexual satisfaction, and domestic violence. Although frequency of use was assessed for several substances, only alcohol, marijuana, and cocaine were used frequently enough for statistical analyses. The highest frequency of use within the couple in the past 2 months as well as the discrepancy in the frequency of use between the 2 members of the couple were considered. Although daily substance use was relatively rare in this sample, alcohol use was reported by 79%, marijuana use by 35%, and cocaine use by 15% of the men. Domestic violence was not associated with any substance use variable. Marijuana use was generally not associated with relationship quality. Alcohol and cocaine use were moderately associated with several indicators of poorer relationship quality.