Could a single pill prevent HIV and STIs? new study explores doxycycline dosing

This study looked at how different doses of the antibiotic doxycycline reach tissues in the rectum and vagina. The goal is to combine doxycycline with HIV drugs into one pill that people could take just before sex to prevent both HIV and other sexually transmitted infections. 45 healthy adults took doxycycline and provided tissue samples to measure drug levels. The study did not test whether the pill actually prevents infections, only how well the drug gets into the body.