Doxycycline to prevent STIs in high-risk people
Part of Infections clinical trials.
This study tests whether taking a daily antibiotic (doxycycline) can prevent sexually transmitted infections in people at high risk. If you've had an STI recently and sometimes have sex without condoms, you might be able to join.
Summary written for real people, not researchers, by Clin2.
Who can take part
- You are 13 to 29 years old.
- You have had a sexually transmitted infection (like gonorrhea, chlamydia, or early syphilis) in the past year.
- You have had sex without a condom at least once in the past month.
- You weigh at least 99 pounds (45 kilograms).
- You are not male, not pregnant or breastfeeding, and have no allergy to tetracycline antibiotics.
- You have a smartphone that can access the study app.
Quick eligibility check
Answer a few plain-language questions, based on this study's own requirements, to get a preliminary sense of fit.
Similar studies
Other trials that look related to this one.
This trial tests whether taking the antibiotic doxycycline can prevent sexually transmitted infections (STIs) like chlamydia, gonorrhea, and syphilis in people at higher risk. If you are a man or transgender woman who has sex with men, are living with HIV or on PrEP, and have had an STI in the past year, you may be able to join.
This trial tests whether taking a single dose of doxycycline after sex can prevent common sexually transmitted infections (STIs) like gonorrhea, chlamydia, and syphilis in men who have sex with men (MSM) in Bangkok.
This trial tests if taking a daily antibiotic (doxycycline) for two weeks can treat early syphilis in adults. It may help people who have been diagnosed with primary, secondary, or early latent syphilis.
This trial tests whether STI testing during pregnancy helps more women start and stay on PrEP (a daily pill that prevents HIV). If you join, you'll help find better ways to protect both mother and baby from HIV.
This trial tests whether taking doxycycline can lower the chance of getting bacterial sexually transmitted infections like syphilis, gonorrhea, and chlamydia. It is aimed at men who have had these infections recently and expect to keep having multiple male partners.
This study tests whether taking a short course of the antibiotic doxycycline after sex can prevent bacterial STIs (like chlamydia, gonorrhea, and syphilis) in women at higher risk. It lasts one year and uses a smartphone app to track your health.
Hear when a new Gonorrhea trial opens
We’ll email you when one opens — at most once a week, no account needed, unsubscribe anytime.