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Doxycycline pre-exposure prophylaxis against sexually transmitted infections

Doxycycline preexposure versus postexposure prophylaxis for sexually transmitted infections, multi-center, open-label, randomized controlled trial

Status
Recruiting
Phases
Phase 3
Study type
Interventional
Source
JPRN
Registry ID
JPRN-jRCTs031240520
Enrollment
220
Registered
2024-12-03
Start date
2024-12-05
Completion date
Unknown
Last updated
2026-06-29

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

Sexuall Transmitted Disease Chlamydia trachomatis, Neisseria gonorrhoeae, Treponema pallidum, Mycoplasma genitalium, doxycycline

Interventions

Study group: Single 200 mg dose of Vibramycin 2 to 24 hours prior to sexual intercourse, administered each time of sexual intercourse Control group: Single 200 mg dose of Vibramycin within 72 hours af

Sponsors

Mizushima Daisuke
Lead Sponsor

Eligibility

Sex/Gender
Male

Inclusion criteria

Inclusion criteria: The applicant must meet all of the following conditions (1) through (4). (1) Persons aged 18 or older who are attending our sexual health (SH) clinic. (2) Persons with a history of sexually transmitted infections while attending the SH clinic. (3) Those who are on PrEP (pre-exposure prophylaxis) for HIV (4) Persons who have given written consent to participate in the study.

Exclusion criteria

Exclusion criteria: (1) Those who are allergic to any of the study drugs (2) Other cases in which the physician in charge determines that participation in the study is inappropriate.

Design outcomes

Primary

MeasureTime frame
the occurrence of a first STI (gonorrhoea, chlamydia, or syphilis) during the follow-up period.

Secondary

MeasureTime frame
The occurrence of a first each sexually transmitted infection (chlamydia, gonorrhea, syphilis, genitalium). Incidence rate of any of chlamydia, gonorrhea, or syphilis. Incidence rate of each sexually transmitted infection (chlamydia, gonorrhea, syphilis, and genitalium). Adherence to medications. Percentage of adverse events.

Contacts

Public ContactDaisuke Mizushima

National Center for Global Health and Medicine

dmizushi@acc.ncgm.go.jp+81-3-302-7181

Outcome results

None listed

Source: JPRN (via WHO ICTRP) · Data processed: Jul 3, 2026