Motives for choosing, switching and stopping daily or event-driven pre-exposure prophylaxis - a qualitative analysis.

INTRODUCTION: In settings where both daily and event-driven pre-exposure prophylaxis (PrEP) are offered to men who have sex with men (MSM), a clear understanding of the motives to choose between the different dosing-regimens can facilitate more effective PrEP implementation. We therefore studied the motives for choosing for, switching between, and stopping daily or event-driven PrEP. METHODS: We used data (August 2015-June 2017) from the prospective, longitudinal, open-label Amsterdam PrEP demonstration study, in which daily (dPrEP) and event-driven PrEP (edPrEP) were offered to 374 HIV-negative MSM and two transgender persons. Participants self-selected the preferred PrEP-regimen at baseline and could switch regimens at three-monthly follow-up visits. We measured motives for choosing PrEP-regimen at baseline and for switching and stopping PrEP at follow-up visits. Open- and closed-end items were combined and qualitatively analysed. RESULTS: Choices of PrEP-regimens were determined by personal and contextual factors, involving the perceived self-efficacy concerning adherence, the risk-context, and the anticipated impact of PrEP on physical and sexual wellbeing. dPrEP was preferred because of the anticipated better adherence and the fear of side-effects relating to edPrEP re-initiations. Moreover, dPrEP was perceived to be more effective than edPrEP. Motives to choose edPrEP were the expected physical burden of dPrEP, anticipated side-effects of dPrEP, and fear to forget daily doses. Regarding the risk-context: dPrEP was preferred for unplanned and/or frequent sex, while edPrEP was chosen when risk was predictable and/or less frequent. While some chose for dPrEP to gain more sexual freedom, others chose for edPrEP to minimize sexual risk episodes. Changes in the above factors, such as changing risk patterns, changing relationships or changing physical conditions, resulted in switching regimens. Choices to stop PrEP were related to lower sexual risk, adherence issues and side-effects. CONCLUSIONS: The great diversity of motives illustrates the importance of offering a choice of PrEP-regimens. In counselling of MSM starting PrEP, choices for PrEP-regimens may be addressed as a continuum of flexible and changeable options over time. This may help individuals choose the PrEP-regimen that best fits their current sexual context, priorities and personal capabilities and therefore will be more easily adhered to.

Men who have sex with men more often chose daily than event-driven use of pre-exposure prophylaxis: baseline analysis of a demonstration study in Amsterdam.

INTRODUCTION: The Amsterdam PrEP project is a prospective, open-label demonstration study at a large sexually transmitted infection (STI) clinic. We examined the uptake of PrEP; the baseline characteristics of men who have sex with men (MSM) and transgender persons initiating PrEP; their choices of daily versus event-driven PrEP and the determinants of these choices. METHODS: From August 2015 through May 2016, enrolment took place at the STI clinic of the Public Health Service of Amsterdam, the Netherlands. MSM or transgender persons were eligible if they had at least one risk factor for HIV infection within the preceding six months. Participants were offered a choice between daily or event-driven use of tenofovir/emtricitabine. Baseline data were analysed using descriptive statistics and multivariable analysis was employed to determine variables associated with daily versus event-driven PrEP. RESULTS: Online applications were submitted by 870 persons, of whom 587 were invited for a screening visit. Of them, 415 were screened for eligibility and 376 initiated PrEP. One quarter (103/376, 27%) chose event-driven PrEP. Prevalence of bacterial STI was 19.0% and mean condomless anal sex (CAS) episodes in the preceding three months were 11. In multivariable analysis, older age (≥45 vs. ≤34, aOR 2.1, 95% CI 1.2 to 3.9), being involved in a steady relationship (aOR 1.7, 95% CI 1.0 to 2.7), no other daily medication use (aOR 0.6, 95% CI 0.3 to 0.9), and fewer episodes of CAS (per log increase aOR 0.7, 95% CI 0.6 to 0.9) were determinants for choosing event-driven PrEP. DISCUSSION: PrEP programmes are becoming one of the more important intervention strategies with the goal of reducing incident HIV-infection and we were unable to accommodate many of the persons applying for this study. Offering a choice of dosing regimen to PrEP users may enable further personalization of HIV prevention strategies and enhance up-take, adherence and cost-effectiveness. CONCLUSIONS: The majority of participants preferred daily versus event-driven use. Within this majority, a high number of CAS episodes before PrEP initiation was reported and we observed a high prevalence of STI. Determinants of choosing event-driven PrEP were older age, fewer CAS episodes, no other daily medication use, and involved in a steady relationship.