Rates of sexually transmitted infections have increased among men who have sex with men (MSM), but there might be a way to reduce this risk.

In a recent study of 232 MSM, scientists found that men who took the antibiotic doxycycline within 72 hours after condomless sex were less likely to develop syphilis and chlamydia infections compared to men who didn't take the drug. 

It's still too early for doctors to recommend this practice, however. Researchers need to determine how this strategy would work in the long term and whether antibiotic resistance would be an issue. 

More details on the study can be found here.