| Not yet recruiting | 3 | 760 | US | Doxycycline hyclate delayed released 200 mg, Doxycycline hyclate delayed released 200 mg weekly | Westat, Eunice Kennedy Shriver National Institute of Child Health and Human Development (NICHD), National Institute of Allergy and Infectious Diseases (NIAID)/Division of AIDS (DAIDS), National Institute on Drug Abuse (NIDA), National Institute of Mental Health (NIMH), National Institutes of Health (NIH) | Gonorrhea, Chlamydia, Syphilis, Sexually Transmitted Infections (STIs) | 06/27 | 06/28 | | |