The U.S. Public Health Service recently issued guidelines about the daily use of medication as preexposure prophylaxis (PrEP) to prevent HIV infection. The guidelines, based on randomized trials showing substantial reduction in HIV transmission among those receiving a daily combination of tenofovir and emtricitabine, suggest physicians offer PrEP to patients at high risk, including nonmonogamous men who have sex with men, serodiscordant couples (in both male-male and male-female relationships), heterosexual men and women in other risk groups (such as sex workers or those with recent sexually transmitted infection), and injection drug users. Here, 2 prominent HIV experts debate the use of PrEP in a 45-year-old man whose husband has HIV infection with an undetectable viral load on treatment. They discuss the patient's risk for HIV transmission from his husband and from other partners, the magnitude of the risk reduction he would gain with PrEP, and nonpharmacologic alternatives to reduce his likelihood of contracting HIV infection.

The close of the American College of Physician's (ACP) centennial year is an opportune time to reflect on the organization's important role in professional development and advocating for sound health policy. Organized medicine provides a professional home where members can participate in scholarly activities and access guidance that will help them to be better doctors. Professional organizations also serve patients by improving physicians' knowledge and skill, being a public repository of health-related information, and advocating for improvement of public health. High-functioning medical professional organizations, such as ACP, also function intentionally as moral agents through well-designed efforts to advocate for patients and the public.

Once-weekly glucagon-like peptide-1 receptor agonists (GLP-1RAs) are new drugs for the treatment of type 2 diabetes.