The Centers for Disease Control (CDC) estimates that 1.2 million people in the United States are at substantial risk for acquiring HIV.  Luckily, there is now a daily pill that can protect them.  This approach — called called Pre-Exposure Prophylaxis, or PrEP — reduces a person’s risk of acquiring HIV if exposed to the virus by 90% or more.

PrEP is a term that can refer to any medicine that prevents a disease or condition rather that treating it. Hormonal contraceptives, for example, are technically … More