Use of antibiotic to reduce STIs appears to be fueling some antibiotic resistance, research shows

When several countries endorsed the notion of some high-risk people taking the antibiotic doxycycline after unprotected sex to lower their chances of contracting a sexually transmitted disease, as the U.S. did last year, there was a theoretical concern the shift could drive antibiotic resistance in some bacterial infections.

That risk no longer appears to be theoretical.