PrEP Intervention for People Who Inject Substances and Use Methamphetamine

New HIV infections among people who inject drugs (PWID) are increasing in the United States and San Francisco. Methamphetamine is a driving force in the transmission of HIV. Multiple studies across diverse populations have found methamphetamine use to be independently associated with both injection and sexual risk behaviors for HIV acquisition. Men who have sex with men (MSM) who inject methamphetamine are at particularly elevated risk for HIV from both injection and sexual risk behaviors.

Daily, oral pre-exposure prophylaxis (PrEP) is safe and highly effective for HIV prevention when taken consistently. The Centers for Disease Control and other health agencies recommend PrEP for PWID. Despite this recommendation and increasing PrEP use in the US, almost no PrEP studies or demonstration projects have focused on PWID. The small number of studies that have evaluated PrEP use among MSM who inject methamphetamine have shown slow PrEP uptake and adherence challenges.

The PRIME study will randomize 140 people assigned male sex at birth who use methamphetamine, are HIV-negative, and have recently engaged in an HIV sexual risk behavior to video directly observed therapy with contingency management (VDOT-CM) and counseling or counseling alone for 24 weeks. The primary aim of this study is to evaluate if VDOT-CM helps people who were assigned male sex at birth who use methamphetamine adhere to daily PrEP for HIV prevention. Participants will be assigned male sex at birth, age 18 years or older, who have used methamphetamine within the past 30 days, are HIV negative and interested in initiating PrEP, and report condomless sero-unknown/discordant sex in the past 12 months. Participants may also be individuals who recently started PrEP with an outside provider.

All subjects will complete the following study visits: screening, enrollment, follow-up visits 6, 12, and 18 weeks from enrollment, and a final follow-up visit at 24 weeks. At screening, enrollment, and all follow-up visits, laboratory testing for HIV, gonorrhea, chlamydia, and methamphetamine metabolites will be done. Syphilis and creatinine testing will be done at screening and week 24. Syphilis testing will also be done at enrollment and week 12. In addition, hepatitis B surface antigen (HBsAg) and hepatitis C antibody (HCV) testing will be done at the screening visit. HCV testing will also be done at the week 24 visit.

At screening a medical history and physical exam will be performed; during enrollment and follow-up a symptom-directed exam will be performed at all visits, and under clinician discretion, a medical history and full exam will be done if needed. AEs will be assessed starting at enrollment and throughout follow-up. Vital signs and weight will be checked at all visits. Some lab procedures will vary if the participant receives PrEP from their own provider or is enrolled remotely.

At enrollment, participants will be randomized 1:1 to receiving only Integrated Next Step Counseling (iNSC) or iNSC and video directly-observed therapy (VDOT) with contingency management (CM). All participants will receive iNSC throughout their participation to support PrEP adherence and help their reduce risk for HIV. Dried blood spots (DBS) will be collected for FTC/TAF drug level testing at weeks 6, 12, 18, and 24. Participants randomized to the VDOT-CM arm will be asked to record taking their daily PrEP dose on VDOT every day from enrollment through week 24.

In-depth interviews will be conducted with at least 36 participants (18/arm) and participants who discontinue PrEP early or become infected with HIV during the study.