HIV prevention treatment shows gaps among key populations

A large, detailed look at patients taking HIV-prevention drug therapy finds strong adherence soon after patients get the prescription, but less consistent use thereafter, particularly among groups considered high priority for receiving the medication.

The study, published August 26 in JAMA Network Open, examined data from 13,906 members of Kaiser Permanente in Northern California referred for pre-exposure prophylaxis, or PrEP, therapy between 2012 and 2019. The study found certain groups were more likely to stop taking PrEP: young people, Black and Latino individuals, women, and people with substance use disorders.

The findings suggest targeted strategies are needed to support use of this highly effective, protective medication in groups at increased risk for HIV acquisition, said lead author Carlo Hojilla, RN, PhD, a research fellow with the Kaiser Permanente Northern California Division of Research.

“The findings have important implications that suggest access to health care is a great way to get people in the door, but we need more effective strategies for making sure people who have an ongoing need for PrEP stay on the medication,” Hojilla said. “These are groups we want to reach, and we need innovative approaches to keep them engaged in PrEP care.”

The study found that a high rate of patients referred for HIV prevention care received a prescription for PrEP (88%), and most of them filled their initial prescriptions (98%). There are 2 main brands of PrEP therapy (Truvada and Descovy), which are generally taken daily to avoid contracting HIV. “These findings were encouraging,” Hojilla said. “Kaiser Permanente has managed to do really well increasing uptake of PrEP therapy.”

However, there was significant inconsistency in use during the study period, with about half of users discontinuing PrEP medication at least once; 60% of those who discontinued later filled a prescription again. This analysis did not look at why users stopped or restarted the drugs, the authors said, and some users may have discontinued PrEP because of a decrease in risk for HIV acquisition. Prior studies have also documented medical mistrust, stigma, homophobia, and transphobia as barriers to PrEP uptake and persistence in some communities.

“We know cost can be a big concern for some people, and this study included a time period before PrEP-related services were provided at no cost as a result of changes in recommendations by the U.S. Preventive Services Task Force,” Hojilla said.

The study was also carried out before the introduction of a new option for dosing known as 2-1-1, or on-demand, which allows the user to take PrEP only around the time of a potential exposure to HIV, with a similar level of effectiveness as daily dosing. It’s possible that some of the discontinuation reflected in the study was from patients who opted to not take the drug daily because they had only occasional risk exposure, even prior to 2-1-1 dosing being formally recommended, said senior author Jonathan Volk, MD, an infectious disease specialist with The Permanente Medical Group.

Among those who remained on PrEP therapy, there were no new HIV infections, the study found. “This shows how incredibly well PrEP works when taken,” Dr. Volk said. “But there are important opportunities for us to maximize the population level impact of this vital therapy. To do this, we need to avoid attrition along the care continuum, especially by assisting patients to stay on PrEP throughout periods of risk for HIV acquisition.”

The same research group at Kaiser Permanente reported in 2015 that PrEP effectively stops HIV infections among early users. They also reported in 2020 that on-demand dosing was effective in preventing HIV among 279 male patients.

This study was funded by a Kaiser Permanente Community Benefit research grant and the National Institutes of Health.

About Kaiser Permanente

Kaiser Permanente is committed to helping shape the future of health care. We are recognized as one of America’s leading health care providers and not-for-profit health plans. Founded in 1945, Kaiser Permanente has a mission to provide high-quality, affordable health care services and to improve the health of our members and the communities we serve. We currently serve approximately 12.5 million members in 8 states and the District of Columbia. Care for members and patients is focused on their total health and guided by their personal Permanente Medical Group physicians, specialists, and team of caregivers. Our expert and caring medical teams are empowered and supported by industry-leading technology advances and tools for health promotion, disease prevention, state-of-the-art care delivery, and world-class chronic disease management. Kaiser Permanente is dedicated to care innovations, clinical research, health education, and the support of community health.