DoxyPEP's Impact: New Evidence Shows Promise and Challenges in STI Prevention
After nearly two decades of rising sexually transmitted infection (STI) rates in the United States, the Centers for Disease Control & Prevention (CDC) 2023 surveillance report reveals a welcome shift: overall STI rates dropped by 1.8% from 2022 to 2023. Gonorrhea cases declined by 7% for the second straight year, and primary and secondary syphilis fell by 10%—marking the first significant decrease in more than two decades. While these figures offer cautious optimism, questions remain about how best to sustain momentum, especially amid ongoing concerns about antimicrobial resistance and unequal access to prevention resources.
One potentially transformative intervention gaining traction is doxycycline post-exposure prophylaxis (doxyPEP). The CDC’s 2024 guidelines recommend doxyPEP for gay, bisexual, and other men who have sex with men (MSM), as well as transgender women, who have experienced a bacterial STI in the past year. Although clinical trials showed promising efficacy against chlamydia and syphilis, real-world data underscore nuanced challenges related to resistance, health disparities, and local healthcare capacity.
The Changing Landscape of STI Prevention
Several initiatives set the stage for the recent slowdown in STI rates. The American Rescue Plan Act of 2021 provided funding to strengthen the disease intervention specialist workforce, bolstering capacity for targeted contact tracing and clinical follow-up. These efforts were amplified by new CDC recommendations that formalized doxyPEP for specific high-risk groups.
San Francisco became an early adopter of doxyPEP guidelines in October 2022, leveraging its established HIV prevention infrastructure and community partnerships. Early clinical trial data had shown marked drops in chlamydia and syphilis, prompting local officials to adopt prophylactic antibiotic use despite concerns over potential misuse and growing gonococcal resistance. Their experience would soon be mirrored and examined in other healthcare settings.
Real-World Evidence: San Francisco and Kaiser Permanente
Two new studies illuminate the impact of doxyPEP beyond controlled clinical environments. The first, conducted by the San Francisco Department of Public Health, examined STI rates before and after the city’s 2022 adoption of doxyPEP guidelines. Investigators reported a 49.6% drop in chlamydia and a 51.4% decline in early syphilis compared to what forecasts had predicted. Three sentinel STI clinics observed that 19.5% of eligible gay, bisexual, and other men who have sex with men, as well as transgender women, initiated doxyPEP—a relatively high uptake for a new intervention.
A complementary Kaiser Permanente Northern California study included more than 11,000 participants already on HIV pre-exposure prophylaxis (PrEP). Those who added doxyPEP to their prevention repertoire saw chlamydia rates fall from 9.6% to 2.0% every quarter, while syphilis rates declined from 1.7% to 0.3%. These improvements closely mirrored prior clinical trial data, underscoring doxyPEP’s real-world effectiveness in high-risk populations.
However, the two studies diverged in their findings on gonorrhea. San Francisco observed a 25.6% increase in gonorrhea cases among the doxyPEP group, while Kaiser Permanente achieved a modest 12% reduction. Even in the latter setting, the intervention had varying efficacy based on infection site, with minimal impact on pharyngeal gonorrhea. Researchers attribute these discrepancies to existing tetracycline resistance patterns, which can range from 20% in U.S. gonorrhea strains to over 50% in certain regions globally.
Key Challenges to Implementation
1. Antimicrobial Resistance
Chief among concerns is the capacity of gonorrhea and other pathogens to develop resistance to tetracyclines. A modeling study in The Lancet warns that if doxyPEP achieves very high uptake—around 90%—it could lose effectiveness within just 1.6 years. More moderate adoption might prolong utility but still faces the ever-present risk that gonococcal strains could quickly evolve. The tension between scaling up prophylaxis to curb infections and preserving antibiotic utility for the long term remains a core dilemma for public health agencies.
2. Limited Healthcare Infrastructure
Successfully rolling out doxyPEP also requires robust clinical infrastructures. San Francisco’s early adoption relied on specialized STI clinics, disease intervention specialists, and strong community engagement. Such resources are scarce in many rural areas and underresourced urban centers, where STI burdens are often high. Without targeted funding and workforce development, these regions may fail to realize the potential benefits of prophylaxis. This gap underscores why a one-size-fits-all strategy for doxyPEP is unlikely to work uniformly nationwide.
3. Cost and Insurance Access
The Kaiser Permanente experience highlighted how commercial insurance coverage can determine doxyPEP uptake. Though Kaiser found no racial or ethnic disparities in its cohort, the ability to pay for routine tests and antibiotics remains a significant hurdle for many. Nearly half of all new STIs affect patients aged 15–24, a demographic often lacking stable insurance. Safety-net providers, such as community clinics and public health agencies, will need additional resources to prevent cost barriers from fueling inequities in STI prevention.
Addressing Health Equity
Disparities in STI burden persist despite national declines. CDC data show that Black communities—though comprising just 12.6% of the population—face roughly a third of all reported STIs, and American Indian and Alaska Native populations have the highest rates of syphilis. These patterns reflect structural inequities, from healthcare access to economic stability. DoxyPEP, if expanded, could either narrow or widen these gaps, depending on implementation strategies.
For example, the San Francisco Department of Public Health’s success relied on partnerships with community-based organizations that serve LGBTQ+ populations, bilingual outreach, and peer educators who could directly address stigma. Similar culturally tailored approaches will be crucial elsewhere. Nationally, any prophylaxis effort must acknowledge social determinants of health, from limited insurance coverage to historical medical mistrust, as central issues in achieving equitable outcomes.
Policy Recommendations
Meeting these challenges head-on requires collaboration among federal agencies, healthcare systems, and local organizations. Four policy domains stand out:
Robust Surveillance and Resistance Tracking
Establish or enhance regional testing to promptly detect shifts in gonococcal resistance.
Standardize reporting on doxyPEP uptake, stratifying data by race, ethnicity, and insurance status to monitor equity.
Integrated Healthcare Delivery
Incorporate doxyPEP into existing HIV PrEP programs, leveraging shared clinical workflows for ongoing STI screening.
Provide decision-support tools to guide providers in identifying those most likely to benefit from prophylaxis and in understanding local resistance rates.
Financing and Insurance Coverage
Secure coverage mandates or subsidies so that the costs of antibiotics and regular STI tests do not fall disproportionately on those most at risk.
Offer grants or incentives for safety-net clinics to scale up prevention services, including patient education and follow-up testing.
Antimicrobial Stewardship and Patient Education
Develop guidelines for targeted doxyPEP use to minimize unnecessary exposure—especially for gonorrhea, given its evolving resistance.
Emphasize correct usage and follow-up testing in patient education to ensure prophylaxis remains effective and that potential side effects are promptly reported.
Looking Ahead: Balancing Innovation and Stewardship
DoxyPEP’s success in specific cohorts highlights how targeted prophylaxis can substantially reduce chlamydia and syphilis infections. However, higher gonococcal resistance in some locales points to the need for continual surveillance and swift policy adjustments. Achieving a balance between curbing acute STI outbreaks and safeguarding long-term antibiotic effectiveness will require:
Adaptive Guidelines: Quickly revising prescribing recommendations if local data reveal resistance spikes.
Equitable Implementation: Ensuring consistent uptake in historically underserved communities, rather than concentrating benefits among those with robust insurance.
Global Collaboration: Sharing best practices and emerging data to keep pace with evolving gonococcal strains and develop new therapeutic agents or vaccines.
Conclusion
The modest national declines in STI rates are a reminder that with strategic investments and coordinated interventions, progress is possible. DoxyPEP stands out as a promising addition to the prevention toolbox—particularly for chlamydia and syphilis—when backed by sufficient testing, monitoring, and community outreach. Yet the specter of antimicrobial resistance, along with ongoing disparities in healthcare access, underscores that a single biomedical solution must be carefully managed.
Findings from San Francisco and Kaiser Permanente prove doxyPEP can effectively reduce STI incidence in real-world settings. Whether it remains a durable tool will depend on collective commitment: policymakers must fund surveillance and outreach, clinicians must practice stewardship, and communities must engage to ensure equitable access. If implemented wisely, doxyPEP could shape a future where the burden of STIs—and the inequalities that fuel them—diminish, showcasing how targeted prevention strategies can enhance public health without jeopardizing our arsenal of antibiotics.
New CDC Guidance Backs DoxyPEP Amid STI Surge, Political Controversy
The United States is grappling with a surge in sexually transmitted infections (STIs), with alarming increases in syphilis, gonorrhea, and chlamydia. According to the Centers for Disease Control & Prevention (CDC), syphilis rates have risen by 80% since 2018, gonorrhea cases have increased by 11%, and chlamydia remains high despite a slight decrease. This underscores the urgent need for innovative prevention strategies. One such strategy, Doxycycline Post-Exposure Prophylaxis (DoxyPEP), has emerged as a powerful tool in the fight against STIs, but it has also become a target of politically-motivated attacks fueled by misinformation and bigotry. DoxyPEP involves taking a dose of the antibiotic doxycycline after condomless sex to prevent bacterial STIs. While studies have repeatedly demonstrated its safety and efficacy, certain politicians, most notably Florida Senator Marco Rubio, have launched a crusade against DoxyPEP, jeopardizing the health and well-being of countless people.
While Senator Rubio and others leverage misinformation to fuel a politically-motivated crusade against the CDC’s new DoxyPEP guidelines, the evidence is clear: DoxyPEP is a safe, effective, and urgently needed tool to combat the nation's skyrocketing STI rates, particularly among the LGBTQ+ community already facing systemic healthcare disparities.
DoxyPEP: Backed by Science, Embraced by Communities
Fortunately, the effectiveness of DoxyPEP isn't based on conjecture or political ideology; it's firmly rooted in scientific evidence. Numerous studies have demonstrated its remarkable ability to reduce STI rates among those most vulnerable. In the groundbreaking DoxyPEP trial, researchers observed a sustained decrease in STI incidence among participants taking DoxyPEP, even with a short-term increase in sexual partners and condomless sex acts, as reported in Infectious Disease Special Edition. Further bolstering these findings, a separate study from the University of California, San Francisco, revealed that DoxyPEP reduced the risk of chlamydia and gonorrhea by nearly 70% among participants. These findings, along with a growing body of research, make it clear that DoxyPEP is a powerful tool with the potential to significantly impact the STI epidemic.
Real-World Success
The positive impact of DoxyPEP extends beyond clinical trials and into real-world settings. In San Francisco, where public health officials have proactively implemented DoxyPEP, the results have been significant. A study by the San Francisco Department of Public Health found that among participants, overall STI incidence fell by 58% after starting DoxyPEP. Chlamydia cases dropped by 67%, and early syphilis cases decreased by 78%. These real-world outcomes highlight the potential of DoxyPEP to effectively curb STI transmission when embraced by the community.
Addressing Resistance Concerns
One of the most frequently raised concerns about DoxyPEP is its potential to contribute to antibiotic resistance. While this is a valid concern that warrants careful consideration, the evidence suggests that the benefits of DoxyPEP outweigh the risks when implemented responsibly. As the CDC states in its report, "The potential for DoxyPEP to increase antimicrobial resistance is a theoretical concern, but current data do not suggest that DoxyPEP use has resulted in substantial increases in resistance." This finding is further bolstered by a study from the University of California, San Francisco, which found no significant increase in antibiotic resistance genes among DoxyPEP users. Additionally, the CDC emphasizes that the short course of doxycycline used in DoxyPEP, coupled with ongoing monitoring for resistance trends, can help mitigate this risk. These findings should reassure policymakers and the public that DoxyPEP, when implemented responsibly as part of a comprehensive STI prevention strategy, is unlikely to exacerbate the already concerning issue of antibiotic resistance.
Community Acceptance
Not only is DoxyPEP backed by robust scientific evidence, but it has also been met with enthusiasm and acceptance from the very communities it aims to protect. When offered DoxyPEP as a prevention option, people at risk for STIs have demonstrated a strong desire to incorporate this tool into their sexual health practices. In San Francisco, for example, Dr. Hyman Scott reported that "about 39% of people ultimately decided that they wanted DoxyPEP as an STI prevention tool." This positive reception speaks volumes about the willingness of people to take charge of their sexual health and embrace new strategies for protecting themselves and their partners.
Political Roadblocks: Rubio's Disinformation Campaign
Despite the overwhelming scientific evidence and the positive response from those most impacted by STIs, DoxyPEP faces a formidable roadblock: a politically-motivated disinformation campaign spearheaded by figures like Senator Rubio. Driven by what appears to be a combination of ideological opposition and a disregard for evidence-based policymaking, Rubio has repeatedly attempted to discredit DoxyPEP and undermine its adoption.
In a press release riddled with inflammatory language, Senator Rubio proclaimed, “The CDC’s unscientific recommendation is dangerous and could lead to more antibiotic-resistant infections and deaths." This statement, however, directly contradicts the findings of the CDC itself, which clearly show that current data do not suggest that DoxyPEP use has resulted in substantial increases in resistance. Furthermore, Rubio's assertion that the CDC's recommendation is "unscientific" ignores the rigorous research and clinical trials that have consistently demonstrated DoxyPEP's safety and efficacy.
By cherry-picking statistics about antibiotic resistance without acknowledging the nuances of DoxyPEP's implementation and the evidence mitigating those risks, Rubio engages in a dangerous game of misinformation. His tactics, unfortunately, have the potential to dissuade patients from accessing a potentially life-saving prevention tool and hinder efforts to curb the STI epidemic.
Unmasking the Agenda
A closer look at Senator Rubio's record reveals a disturbing pattern of opposition to policies that benefit the LGBTQ+ community, raising serious questions about the motivations behind his crusade against DoxyPEP. His voting history, as reflected in his 0 out of 100 score on the Human Rights Campaign's Congressional Scorecard, paints a picture of an anti-LGBTQ+ agenda. From opposing marriage equality to supporting discriminatory bathroom bills, Rubio has consistently aligned himself with those who seek to marginalize and harm the LGBTQ+ community.
As HRC President Kelley Robinson aptly stated, "Throughout his career, Sen. Rubio has repeatedly put his personal beliefs ahead of the needs of his constituents, particularly LGBTQ+ Floridians." His stance on DoxyPEP, a measure that would primarily benefit men who have sex with men (MSM) and transgender women, aligns with this pattern of disregard for the well-being of the LGBTQ+ community. By framing a scientifically sound public health intervention as "dangerous" and "unscientific," Rubio perpetuates harmful stereotypes and undermines efforts to address a health crisis that disproportionately impacts LGBTQ+ people.
The Dangers of Politicized Health
The case of DoxyPEP lays bare a disturbing trend in contemporary politics: the cynical manipulation of public health for political gain. When evidence-based interventions like DoxyPEP are distorted and demonized, the consequences extend far beyond a single policy debate. Allowing political agendas to dictate public health decisions undermines trust in science, erodes support for vital programs, and ultimately puts lives at risk.
This pattern of politically-motivated attacks on healthcare is particularly pronounced when it comes to the LGBTQ+ community. Across the country, conservative lawmakers at all levels of government are pushing a discriminatory agenda that seeks to restrict access to essential healthcare services for LGBTQ+ people. From attempts to ban gender-affirming care for transgender youth to efforts to allow healthcare providers to refuse service to LGBTQ+ patients, these attacks represent a clear and present danger to the health and well-being of an already marginalized community.
Senator Rubio's crusade against DoxyPEP must be understood within this broader context. His actions are not about protecting public health; they are about scoring political points by exploiting prejudice and fear. When those in positions of power prioritize ideology over evidence and demonize vulnerable communities, the consequences can be devastating.
The Path Forward: Equity, Access, and Comprehensive Prevention
To effectively address the STI epidemic, we must move beyond the politically-motivated roadblocks erected by those who prioritize ideology over evidence. A truly effective response requires a commitment to equity, access, and comprehensive prevention strategies that center the needs of those most impacted.
It's crucial to acknowledge that STIs do not impact all communities equally. As highlighted in the U.S. Department of Health and Human Services' National Strategic Plan for addressing STIs, certain populations, including gay and bisexual men, transgender people, and young people, bear a disproportionate burden of these infections. This disparity is driven by a complex interplay of factors, including stigma, discrimination, and barriers to accessing quality healthcare. For example, in 2018, more than 50% of primary and secondary syphilis infections occurred among MSM. These disparities demand a targeted and equitable approach to STI prevention, one that prioritizes the needs of those most vulnerable and addresses the systemic factors that contribute to their increased risk.
The Urgency of Action
The urgency of the STI epidemic demands swift and decisive action. We can no longer afford to let misinformation and political maneuvering hinder the implementation of evidence-based solutions like DoxyPEP. As Dr. Jonathon Cherabie, an Infectious Disease physician, pointedly stated on Twitter, "To state that this move [DoxyPEP implementation] is 'political' when two MAJOR trials have shown how beneficial this intervention is, in the midst of a massive increase in STIs especially syphilis is disingenuous." Dr. Cherabie goes on to highlight the hypocrisy of fixating on unfounded fears of antibiotic resistance with DoxyPEP while ignoring its use for other purposes like acne and malaria prophylaxis. His words serve as a potent reminder that the opposition to DoxyPEP often stems not from legitimate scientific concerns, but from a desire to undermine the health and well-being of LGBTQ+ people. Every day that passes without readily available DoxyPEP represents missed opportunities to prevent new infections and protect the health of marginalized communities.
A Multifaceted Approach
It's important to recognize that DoxyPEP, while a powerful tool, is not a standalone solution to the STI epidemic. To truly make a lasting impact, we need a comprehensive approach that addresses the complex nature of this public health crisis.
This comprehensive strategy must prioritize:
Expanded Access to Testing and Treatment: Timely and affordable access to STI testing and treatment is paramount. We must remove financial and logistical barriers that prevent people from seeking care, ensuring that everyone can get tested and treated promptly and effectively.
Comprehensive Sexual Health Education: Accurate, inclusive, and age-appropriate sexual health education is fundamental to empowering people to make informed decisions about their sexual health. We must move away from abstinence-only approaches and embrace education that encompasses a wide range of topics, including consent, contraception, and STI prevention methods.
Addressing Stigma and Discrimination: Stigma surrounding STIs prevents people from seeking testing and treatment, perpetuating the cycle of transmission. We must foster open and honest conversations about sexual health, challenge harmful stereotypes, and create a more supportive and inclusive environment for those affected by STIs, especially at points of care.
Adequate Funding for Public Health Initiatives: Effectively combating the STI epidemic requires robust and sustained funding for public health programs. This includes resources for research, surveillance, prevention programs, and healthcare infrastructure.
Conclusion
The alarming rise of STIs in the United States demands our unwavering attention and a commitment to evidence-based solutions. Inaction is not an option; it carries the weight of preventable infections, long-term health complications, and lives needlessly impacted. DoxyPEP represents “the most exciting intervention for STI prevention in two decades,” a scientifically sound intervention with the potential to significantly curb the STI epidemic, particularly among the LGBTQ+ community. We cannot allow political maneuvering and misinformation campaigns to derail this progress.
As advocates, policymakers, and industry professionals, we have the power to turn the tide against this epidemic:
Integrate DoxyPEP into Policy Agendas: For policymakers, champion legislation and funding initiatives that expand access to DoxyPEP, ensuring its inclusion in Medicaid, ADAPs, and private insurance plans. Advocate for comprehensive sexual health education and robustly funded public health programs.
Harness Your Platform to Disseminate Accurate Information: Leverage your professional networks, social media platforms, and public speaking engagements to counter misinformation surrounding DoxyPEP. Share the overwhelming scientific evidence supporting its efficacy and safety, and challenge those who prioritize political agendas over public health.
Advocate for FDA Approval: While the CDC has issued guidelines for DoxyPEP, it remains an off-label use of doxycycline. Advocate for the FDA to formally approve this use, which would further solidify its legitimacy, potentially expand insurance coverage, and increase confidence among healthcare providers and patients.
The fight for effective STI prevention is a fight for public health, for equity, and for the well-being of us all. Let's leverage our collective influence to ensure that DoxyPEP becomes a standard tool in our arsenal against this urgent public health crisis.