Project FIRST - Financial Incentives to Reduce Substance Use and Improve Treatment

• HIV viral load [ Time Frame: Viral load will be measured every 4 weeks over the 28-week follow-up period. ] [ Designated as safety issue: No ]
  Every 4 weeks participants will undergo phlebotomy to measure HIV viral load. Viral load will be analyzed as a continuous measure (log10 copies/ml). In secondary analyses, viral load will be analyzed dichotomously, as undetectable (<45 copies/ml) or not.
  
  

• CD4 count [ Time Frame: CD4 count will be measured at weeks 0, 4, 20, and 28. ] [ Designated as safety issue: No ]
  At weeks 0, 4, 20, and 28, participants will undergo phlebotomy and CD4 count will be measured. CD4 count will be analyzed as a continuous measure and an increase of 50 cells/mm3 will be considered a clinically significant improvement.
  
  
• Abstinence from opiates, oxycodone, and cocaine [ Time Frame: Abstinence will be measured twice weekly during weeks 0-20, then every two weeks during weeks 21-28. ] [ Designated as safety issue: No ]
  Participants will provide urine samples twice weekly during weeks 0-20, and every two weeks during weeks 21-28. Abstinence will be defined as having drug-free urine (no cocaine, oxycodone and opiates). Abstinence will be examined two different ways—as the proportion of drug-free urines and the number of consecutive drug-free urines. Although urine toxicology tests will be our primary data source for measuring abstinence, we will also measure addiction severity using the Addiction Severity Index.
  
  
• Antiretroviral adherence [ Time Frame: Antiretroviral adherence will be measured every 4 weeks during the 28-week follow-up period ] [ Designated as safety issue: No ]
  Antiretroviral adherence will be measured using pill counts. Adherence will be analyzed as a continuous measure, defined as the proportion of pills taken (# pills taken / # pills prescribed). Mean adherence over each 4-week period will be examined. In addition, we will also analyze adherence as a dichotomous measure (e.g., perfect [100%] adherence or not during each 4-week period).
  
  

Using a randomized controlled study design, the investigators will test the efficacy of an abstinence-reinforcing contingency management intervention compared with a control condition (Performance Feedback) on HIV viral load suppression. The investigators will enroll 202 opioid-dependent HIV-infected individuals who are receiving opioid agonist treatment with buprenorphine or methadone, who continue to use opiates, oxycodone or cocaine (drugs that are consistently associated with poor HIV treatment outcomes), and who are prescribed antiretroviral medication, but with suboptimal viral load suppression. The contingency management group will have the potential to receive up to $1320 in vouchers over the 16-week intervention based on drug-free urine. Participants will be followed for 28 weeks, with research visits occurring twice weekly during the Baseline Period (weeks 1-4) and Intervention Period (weeks 5-20), then every two weeks during the Post-Intervention Period (weeks 21-28). Data sources will include blood tests (viral load and CD4 count), urine toxicology tests, questionnaires, pill counts, and medical records. The primary outcome will be change in HIV viral load, and secondary outcomes will include CD4 count, antiretroviral adherence, and abstinence.