Doxy-Post-exposure Prophylaxis

NCT ID: NCT05853120

Last Updated: 2025-09-11

Basic Information

• Recruitment Status: COMPLETED
• Clinical Phase: PHASE4
• Total Enrollment: 45 participants
• Study Classification: INTERVENTIONAL
• Study Start Date: 2023-05-31
• Study Completion Date: 2024-12-24

Brief Summary

The goal of this project is to collect data regarding the ability of various oral doses of doxycycline to penetrate mucosal tissues in men and women to inform the combination of doxycycline with antiretrovirals (ARVs) for the development of single-dose event-driven multipurpose prevention strategies to protect against HIV and sexually transmitted infections (STIs).

This study is of importance in the field of research because it allows the exploration of new dosing strategies that would permit a single event-driven oral dose of medications that could provide protection from HIV as well as other STIs.

The study population that this study seeks to enroll are healthy people assigned male or female sex at birth and not using gender-affirming hormone therapy and are willing to undergo study procedures.

Recruitment: Both face-to-face and online engagements will be conducted to recruit study participants. Face-to-face locations include bars and nightclubs, community organizations serving study populations, sports events, and community venues, and online engagements include dating sites, social networks, and craigslist, amongst other social medial platforms.

Detailed Description

The incidence of bacterial STIs is increasing and studies have recently shown that Doxy-PEP can reduce the incidence of bacterial STIs among men who have sex with men (MSM) and Doxy-PEP is being explored for STI prevention among women.

A better understanding of mucosal drug penetration of doxycycline will inform the design of future studies to prevent STIs in various populations. The purpose of this study is to understand how well doxycycline taken by mouth gets to the tissues of the rectum and vagina. Researchers think doxycycline could be used to treat sexually transmitted infections (STIs) caused by bacteria. To understand better, they want to see how well doxycycline reaches the tissues affected by STIs.

The study procedures include the collection of past and present medical history, and biological specimen sampling such as blood, rectal and vaginal fluids, tissue biopsies, and urine. Study participants will also be administered an investigational agent (doxycycline not yet approved for this indication).

The duration of this clinical trial for study participants will be approximately 8 weeks.

Conditions

Sexually Transmitted Diseases

Study Design

• Allocation Method: RANDOMIZED
• Intervention Model: PARALLEL
• Primary Study Purpose: PREVENTION
• Blinding Strategy: NONE

Study Groups

Doxycycline 100 mg

Doxycycline 100mg Participants will receive the first assigned dose of Doxycycline at the clinic on days 0 and 3 at the clinic. The other three doses of the medication will be taken at home on days 7 and 10.

Group Type: ACTIVE_COMPARATOR

Doxycycline

Intervention Type: DRUG

Doxycycline is used to treat or prevent infections that are strongly suspected to be caused by bacteria; it is an antimicrobial drug indicated for bacterial infections such as sexually transmitted infections. Doxycycline (DOX) will be given orally at 100 and 200 mg doses.

Doxycycline 200 mg

Doxycycline - 200 mg Participants will receive the first assigned dose of Doxycycline at the clinic on days 0 and 3 at the clinic. The other three doses of the medication will be taken at home on days 7 and 10

Group Type: ACTIVE_COMPARATOR

Doxycycline

Intervention Type: DRUG

Doxycycline is used to treat or prevent infections that are strongly suspected to be caused by bacteria; it is an antimicrobial drug indicated for bacterial infections such as sexually transmitted infections. Doxycycline (DOX) will be given orally at 100 and 200 mg doses.

Interventions

Doxycycline

Doxycycline is used to treat or prevent infections that are strongly suspected to be caused by bacteria; it is an antimicrobial drug indicated for bacterial infections such as sexually transmitted infections. Doxycycline (DOX) will be given orally at 100 and 200 mg doses.

Intervention Type: DRUG

Other Intervention Names

DOX

Eligibility Criteria

Inclusion Criteria

• Aged 18-59 years
• Assigned male sex or female sex at birth
• In good general health
• Not currently taking doxycycline or other tetracycline-derived antibiotics and no plans to initiate during the study
• For HIV-positive people, on stable antiretroviral therapy with an undetectable viral load and CD4 count> 300ul/ml
• Willing to use condoms consistently for the duration of the study
• Able to provide informed consent
• No plans for relocation in the next 4 months
• Not pregnant and does not plan on getting pregnant for the duration of the study
• Willing to undergo peripheral blood, urine, rectal or vaginal secretion collection, and a rectal or vaginal and cervical biopsy procedure
• Willing to use study products as directed

Exclusion Criteria

• Current or chronic history of liver disease
• Continued need for, or use during the 90 days before enrollment, of the following medications:

1. Systemic immunomodulatory agents

2. Supraphysiologic doses of steroids (short course steroids less than 7 days duration, allowable at the discretion of the investigators)

3. Chemotherapy or radiation for treatment of malignancy

4. Experimental medications, vaccines, or biologicals

• Intent to use doxycycline or other tetracycline-derived antibiotics during the study, outside of the study procedures
• Any other clinical condition or prior therapy that, in the opinion of the investigator, would make the patient unsuitable for the study or unable to comply with the study requirements
• Known allergic reaction to study drugs.
• Significant laboratory abnormalities at baseline visit for rectal biopsies, including but not limited to:

1. Hgb ≤ 10 g/dL

2. PTT > 1.5x ULN or INR > 1.5x ULN

3. Platelet count <100,000

• Minimum Eligible Age: 18 Years
• Maximum Eligible Age: 59 Years
• Eligible Sex: ALL
• Accepts Healthy Volunteers: Yes

Sponsors

Centers for Disease Control and Prevention

FED

Sponsor Role: collaborator

Emory University

OTHER

Sponsor Role: lead

Responsible Party

Colleen Kelley

Associate Professor

Responsibility Role: PRINCIPAL_INVESTIGATOR

Principal Investigators

Colleen Kelley, MD, MPH

Role: PRINCIPAL_INVESTIGATOR

Emory University

Locations

Hope Clinic

Atlanta, Georgia, United States

Countries

United States

Provided Documents

Document Type: Study Protocol and Statistical Analysis Plan

View Document

Document Type: Informed Consent Form

View Document

Other Identifiers

75D30122C14484

Identifier Type: OTHER_GRANT

Identifier Source: secondary_id

STUDY00005552

Identifier Type: -

Identifier Source: org_study_id