PrEP is a medication that prevents HIV transmission. When taken as prescribed - usually a pill taken daily - it’s almost 100% effective. It works by helping the body to produce antibodies which prevent HIV from replicating inside the body. Essentially, the drug stops the virus from crossing into the healthy cells and reproducing.
This is a companion discussion topic for the original article at https://patient.info/news-and-features/world-aids-day-who-should-take-prep