Den här översättningen är inte klar ännu. Den här sidan är just nu på engelska.

Gå till den engelska sidan

Cure My Disease

Don't miss your cure!

 Log in / Sign up

Why does Doxy-PEP fail some people? new study aims to find out

NCT ID NCT06414408

Knowledge-focused Sponsor: University of California, San Francisco Source: ClinicalTrials.gov ↗

What the study statuses mean

This study's is highlighted.

Recruitment status, easiest to join first

Recruiting now This study
This trial is taking on new participants right now.
Not yet recruiting
Registered, but not yet taking participants.
By invitation only
Not open to general applications. Only people the study team invites can take part.
Paused
Paused for now. It may or may not start again.
Ongoing
Running, but no longer taking on new participants.
Completed
The trial has finished. Results may not be published yet.
Stopped early
Stopped early, before it reached the end. That can be for many reasons, including safety.
Cancelled
Cancelled before anyone took part.

Expanded access (not trials)

Expanded access
Not a trial. This treatment can be requested outside a study, case by case, for people who qualify.
Expanded access (paused)
Not a trial. The treatment can normally be requested outside a study, but is unavailable right now.
Expanded access (ended)
Not a trial. The treatment could once be requested outside a study, but no longer can.
Approved
The treatment has been approved, so it is available normally rather than through this programme.

When the status isn't known

Details not published
The full record has not been published yet, so there is little to show here.
Status unknown
This status has not been confirmed recently, so it may be out of date.

First seen Jun 27, 2026 · Last updated Sep 04, 2026 · Updated 1 time

Summary

This study looks at why the antibiotic doxycycline, when taken after sex, prevents bacterial STIs in some people but not others. Researchers will measure doxycycline levels in hair, blood, and urine from 48 volunteers to develop better ways to track if people are taking the medication as directed. The goal is to improve future STI prevention efforts.

This is an AI summary of the original study and may miss details. Read our disclaimer.

Study facts

What this study's own registry entry says, in plain language.

Phase

Early phase 1

The earliest testing in people: a first look at safety, in a very small group.

Participants

About 48 people

The number the study aims to enrol. It can still change while the study runs.

Started

Oct 2024

Expected to finish

Dec 2028

An estimate. End dates often move.

Lead sponsor

Other sponsor

The registry's catch-all category, for sponsors it does not file as a company, a government agency, or a research network.

Who can take part

This study's own entry requirements. Only the study team can say for certain whether you qualify.

Ages

18 years and older

Sex

Anyone

Healthy volunteers

Accepted

You do not need to have the condition being studied to take part.

Show the full entry requirements

Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.

Inclusion Criteria: * not currently at risk of a sexually transmitted infection and willing to use other methods, such as condoms, for STI prevention; * if diagnosed with an STI in the past two years and/or a partner was diagnosed with an STI in the past year, is willing to use condoms for STI prevention; * willing to provide hair, blood, and urine samples; * not currently enrolled in other STI prevention studies; * able to speak English * transgender women participants should be currently using estrogen gender affirming hormone therapy with blood estrogen levels demonstrating consistent use * transgender men participants should be currently using testosterone gender affirming hormone therapy with blood testosterone levels demonstrating consistent use * able to provide a hair sample of \~50-100 strands of hair that are non-gray, not bleached, and at least 1cm in length * willing to NOT shave hair or have a very short haircut or apply bleach for the duration of the study * has suitable venous access for consecutive blood draws Exclusion Criteria: * any health condition that may interfere with participation or the ability to provide informed consent, including any debilitating or life-threatening conditions; * pregnancy or plans to become pregnant; * liver cirrhosis or fulminant liver disease; * known hypersensitivity reaction to doxycycline. * detectable doxycycline in hair at enrollment. * unable to provide a hair sample of \~50-100 strands of hair that are non-gray, not bleached, and at least 1cm in length * does not have suitable venous access for consecutive blood draws

Get updates

Get notified about this study

Sign up to get updates when this study changes or when new studies for Sexually transmitted diseases, bacterial are added.

Vår säkerhetsrekommendation!

Genom att skicka in godkänner du våra Användarvillkor

Conditions

The condition(s) this trial relates to.

bacterial sexually transmitted disease

As listed by the trial registrant

The condition terms exactly as the trial's registrant entered them.

Sexually transmitted diseases, bacterial

How to take part

Only the study team decides who joins. These are the ways to reach them.

  1. The places running it

    1 site. The list below names each one and where it is.

  2. The official record

    ClinicalTrials.gov lists the study team's own contact details, including names and phone numbers. We don't republish those.

    Open the record ↗

  3. A doctor treating you

    A doctor who knows your case can contact a study site on your behalf, and can tell you whether this study is worth pursuing at all.

Contacts and locations

Locations

  • University of California, San Francisco/San Francisco General Hospital

    RECRUITING

    San Francisco, California, 94110, United States

More trials for these conditions

Other studies related to the condition(s) this trial covers.