In new guidelines released Tuesday, U.S. health officials now recommend that certain people take the antibiotic doxycycline as a morning-after pill to lower the risk of some sexually transmitted diseases (STDs).

The latest recommendations only apply to gay and bisexual men and transgender women who have had an STD in the past year and are at high risk of getting infected again. While pas...

A strain of highly antibiotic-resistant gonorrhea first emerged in China in 2016, and cases of this tough-to-treat infection have tripled there in just five years, Chinese researchers report.

It's a warning to the rest of the world, they said.

Strains resistant to the first-line treatment ceftr...

Just one dose of the antibiotic doxycycline taken after sex halved the number of chlamydia and syphilis cases in San Francisco, promising new research shows.

In the study, gay and bisexual men and transgender women who had a history of sexually transmitted infections or multiple sex partners were given a supply of the antibiotic and asked to take two 100-milligram pills within 72 hours of...

Data showing that the antibiotic doxycycline might prevent a sexually transmitted infection (STI) if taken soon after sex made headlines earlier this year.

As surging numbers of cases of syphilis and gonorrhea affect more Americans, here's what you need to know about using the drug.

"If you're actively having sex and not using con...

The first home test for chlamydia and gonorrhea will soon hit the market, following its approval Wednesday by the U.S. Food and Drug Administration.

People will be able to buy the Simple 2 Test over-the-counter at a pharmacy, take a specimen in the comfort of their home and send their sample to a designated laboratory for testing, the FDA said.

The test is produced by LetsGetChecked...

The first new antibiotic for gonorrhea -- the second most common sexually transmitted disease -- has shown promise in a clinical trial.

That news should come as a relief to public health experts, because gonorrhea has become resistant to all but one of the existing antibiotics used to treat it.

This new antibiotic, called zoliflodacin, was seen in the