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Showing 25–48 of 24 matching trials from the live ClinicalTrials.gov search.
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Filters: Condition: High Risk Sex Behavior Clear all
Completed Phase 2 Interventional Accepts healthy volunteers

Effectiveness of an HIV Prevention Program That Targets the Inner Workings of High-risk Social Networks

NCT00705705
View directory record Official record
Conditions
HIV Infections
Interventions
Network leader training, Standard HIV risk-reduction counseling
Behavioral
Lead sponsor
Medical College of Wisconsin
Other
Eligibility
18 Years and older
Enrollment
852 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2004 – 2009
U.S. locations
1
States / cities
Milwaukee, Wisconsin
Source: ClinicalTrials.gov public record
Updated Nov 10, 2011 · Synced Jul 22, 2026, 2:19 PM EDT
Completed Not applicable Interventional

The Young Woman's Reach Project: Trial of an Intervention to Impact Contraceptive Behavior, Unintended Pregnancy, and Sexually Transmitted Infections (STIs) Among Adolescent Females

NCT00230880
View directory record Official record
Conditions
Contraceptive Behavior, Sexually Transmitted Diseases
Interventions
follow-up phone counseling
Behavioral
Lead sponsor
University of California, San Francisco
Other
Eligibility
14 Years to 18 Years · Female only
Enrollment
800 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2005 – 2009
U.S. locations
1
States / cities
San Francisco, California
Source: ClinicalTrials.gov public record
Updated Dec 4, 2012 · Synced Jul 22, 2026, 2:19 PM EDT
Terminated Not applicable Interventional Accepts healthy volunteers

NC Young Women's CoOp

NCT02965014
View directory record Official record
Conditions
Condomless Sex, Human Immunodeficiency Virus (HIV), Sexually Transmitted Infection (STI), Alcohol and Drug Use
Interventions
Face-to-Face Young Women's CoOp (YWC), mHealth Young Women's CoOp (YWC), HIV Counseling and Testing
Behavioral
Lead sponsor
RTI International
Other
Eligibility
18 Years to 25 Years · Female only
Enrollment
652 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2017 – 2020
U.S. locations
4
States / cities
Durham, North Carolina • Greensboro, North Carolina • High Point, North Carolina + 1 more
Source: ClinicalTrials.gov public record
Updated Jan 7, 2025 · Synced Jul 22, 2026, 2:19 PM EDT
Terminated Phase 1 Interventional

Behavioral Therapy Development for Methamphetamine Abuse

NCT00252434
View directory record Official record
Conditions
Depression, Drug Abuse, Sexually Transmitted Diseases
Interventions
Cognitive Behavioral Therapy Development for Methamphetamine Abuse
Behavioral
Lead sponsor
University of California, Los Angeles
Other
Eligibility
18 Years to 65 Years · Male only
Timeline
2004 – 2007
U.S. locations
1
States / cities
Los Angeles, California
Source: ClinicalTrials.gov public record
Updated Jan 26, 2016 · Synced Jul 22, 2026, 2:19 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Proyecto SOL: A Risk Reduction Intervention for Hispanic Men Who Have Sex With Men (MSM)

NCT00690976
View directory record Official record
Conditions
HIV Infections
Interventions
Proyecto SOL, HCT
Behavioral
Lead sponsor
Centers for Disease Control and Prevention
Federal
Eligibility
18 Years to 49 Years · Male only
Enrollment
220 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2008 – 2010
U.S. locations
1
States / cities
Fort Lauderdale, Florida
Source: ClinicalTrials.gov public record
Updated Mar 10, 2010 · Synced Jul 22, 2026, 2:19 PM EDT
Completed Phase 1 Interventional Results available

Bupropion For Reducing High-Risk Behaviors in Depressed Men Who Have Sex With Men (MSM)

NCT00285584
View directory record Official record
Conditions
HIV Infections, Depression
Interventions
Bupropion, Placebo
Drug
Lead sponsor
NYU Langone Health
Other
Eligibility
18 Years and older · Male only
Enrollment
41 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2002 – 2004
U.S. locations
2
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Dec 11, 2017 · Synced Jul 22, 2026, 2:19 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available

MI With Text Messaging to Reduce Sexual Risk and Hazardous Drinking Among MSM

NCT03755661
View directory record Official record
Conditions
Alcohol; Harmful Use, Sex, Unsafe
Interventions
MI&TXT4MSM
Behavioral
Lead sponsor
Boston University Charles River Campus
Other
Eligibility
21 Years to 50 Years · Male only
Enrollment
24 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2018 – 2020
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated May 5, 2021 · Synced Jul 22, 2026, 2:19 PM EDT
Recruiting Not applicable Interventional

An Interactive Education Program to Reduce High Risk Behavior in Adolescents Ph II (iTRAC HERO)

NCT06894277
View directory record Official record
Conditions
Risky Sexual Behavior, Emotion Regulation, Adolescent Behavior
Interventions
iTRAC-HERO
Behavioral
Lead sponsor
Klein Buendel, Inc.
Industry
Eligibility
12 Years to 14 Years
Enrollment
120 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2025 – 2026
U.S. locations
1
States / cities
Golden, Colorado
Source: ClinicalTrials.gov public record
Updated Jun 15, 2026 · Synced Jul 22, 2026, 2:19 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

The Evaluation of Pulse: A Mobile Health App and Teen Pregnancy Prevention Program

NCT04043130
View directory record Official record
Conditions
Unprotected Sex, Contraceptive Usage
Interventions
Pulse
Behavioral
Lead sponsor
Child Trends
Other
Eligibility
18 Years to 20 Years · Female only
Enrollment
2,317 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2016 – 2020
U.S. locations
1
States / cities
Baltimore, Maryland
Source: ClinicalTrials.gov public record
Updated Jun 15, 2020 · Synced Jul 22, 2026, 2:19 PM EDT
Withdrawn No phase listed Observational

A Non-Interventional Pilot Study to Explore the Role of Gut Flora in Autism

NCT04100863
View directory record Official record
Conditions
Autism, Autism Spectrum Disorder, Autistic Disorder, Autism, Akinetic, Autism; Atypical, Autism; Psychopathy, Autism Fragile Syndrome X, Autism With High Cognitive Abilities, Autism-Related Speech Delay, Autism, Susceptibility to, 6, Autism Spectrum Disorder High-Functioning, Autistic Thinking, Autism, Susceptibility to, X-Linked 6, Autistic Behavior
Interventions
No Intervention
Other
Lead sponsor
ProgenaBiome
Other
Eligibility
6 Years and older
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2030
U.S. locations
1
States / cities
Ventura, California
Source: ClinicalTrials.gov public record
Updated Jun 4, 2025 · Synced Jul 22, 2026, 2:19 PM EDT
Completed No phase listed Observational Accepts healthy volunteers

HIV and Genital Herpes Among High-Risk Men Who Have Sex With Men (MSM) in Lima, Peru

NCT00023582
View directory record Official record
Conditions
HIV Infections, Herpes Genitalis, HIV Seronegativity, Syphilis
Interventions
Not listed
Lead sponsor
National Institute of Allergy and Infectious Diseases (NIAID)
NIH
Eligibility
18 Years and older · Male only
Enrollment
250 participants
Healthy volunteers
Accepts healthy volunteers
U.S. locations
1
States / cities
Seattle, Washington
Source: ClinicalTrials.gov public record
Updated Aug 7, 2008 · Synced Jul 22, 2026, 2:19 PM EDT
Completed Not applicable Interventional

Prevention of HIV Infection in High-Risk Social Networks of African American Men Who Have Sex With Men (MSM)

NCT01825252
View directory record Official record
Conditions
HIV
Interventions
Social Network Intervention, Counsel, Test, and Treat
Behavioral
Lead sponsor
Medical College of Wisconsin
Other
Eligibility
18 Years and older · Male only
Enrollment
856 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2011 – 2017
U.S. locations
2
States / cities
Cleveland, Ohio • Milwaukee, Wisconsin
Source: ClinicalTrials.gov public record
Updated Feb 14, 2018 · Synced Jul 22, 2026, 2:19 PM EDT
Completed Not applicable Interventional

An Evaluation of Re:MIX: a Teen Pregnancy Prevention Program With Young Parents as Peer Educators, EngenderHealth

NCT03114410
View directory record Official record
Conditions
Sexual Behavior, Unprotected Sex
Interventions
Re:MIX, a multi-layer comprehensive teen pregnancy prevention intervention aimed at reducing pregnancy and STIs among youth ages 13-17
Behavioral
Lead sponsor
Child Trends
Other
Eligibility
12 Years to 18 Years
Enrollment
621 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2016 – 2020
U.S. locations
1
States / cities
Austin, Texas
Source: ClinicalTrials.gov public record
Updated Apr 30, 2020 · Synced Jul 22, 2026, 2:19 PM EDT
Completed No phase listed Observational

Education Program to Reduce Risky Behavior in Adolescents Ph I

NCT05607784
View directory record Official record
Conditions
Risky Sexual Behavior, Emotional Regulation, Adolescent Behavior
Interventions
Formative Research- Content Translation, Formative Research- Content Feedback and Acceptability
Behavioral
Lead sponsor
Klein Buendel, Inc.
Industry
Eligibility
12 Years and older
Enrollment
24 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2022 – 2023
U.S. locations
3
States / cities
Golden, Colorado • Eugene, Oregon • Providence, Rhode Island
Source: ClinicalTrials.gov public record
Updated Sep 14, 2023 · Synced Jul 22, 2026, 2:19 PM EDT
Completed Not applicable Interventional

Advanced Provision of Emergency Contraception: Utilizing Technology to Increase Prescription Fill Rates

NCT01401816
View directory record Official record
Conditions
Sexually Active
Interventions
Text Message
Other
Lead sponsor
Boston Medical Center
Other
Eligibility
13 Years to 21 Years · Female only
Enrollment
60 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2011 – 2012
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Jul 9, 2012 · Synced Jul 22, 2026, 2:19 PM EDT
Completed No phase listed Observational Accepts healthy volunteers

A Test of Behavioral Intervention for Women at High Risk for HIV Infection

NCT00006440
View directory record Official record
Conditions
HIV Infections
Interventions
Not listed
Lead sponsor
National Institute of Allergy and Infectious Diseases (NIAID)
NIH
Eligibility
18 Years and older · Female only
Enrollment
180 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2000 – 2008
U.S. locations
1
States / cities
Cambridge, Massachusetts
Source: ClinicalTrials.gov public record
Updated Oct 30, 2016 · Synced Jul 22, 2026, 2:19 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

MyLife MyStyle Evaluation Project

NCT01640392
View directory record Official record
Conditions
Unsafe Sex
Interventions
MyLife MyStyle group-level intervention
Behavioral
Lead sponsor
Los Angeles County Department of Public Health
Government
Eligibility
18 Years to 29 Years · Male only
Enrollment
528 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2012 – 2015
U.S. locations
1
States / cities
Los Angeles, California
Source: ClinicalTrials.gov public record
Updated Aug 14, 2019 · Synced Jul 22, 2026, 2:19 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Positive Choice: Prevention for Positive Health

NCT00447707
View directory record Official record
Conditions
HIV Infections, Sexual Risk Behavior, Substance Use Risks
Interventions
Positive Choice
Behavioral
Lead sponsor
National Institute on Drug Abuse (NIDA)
NIH
Eligibility
18 Years and older
Enrollment
497 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2003 – 2006
U.S. locations
5
States / cities
Oakland, California • San Francisco, California • San Leandro, California
Source: ClinicalTrials.gov public record
Updated Jan 11, 2017 · Synced Jul 22, 2026, 2:19 PM EDT
Recruiting Not applicable Interventional Accepts healthy volunteers

Alcohol and "Heat of the Moment" Sexual Decision Making

NCT05729256
View directory record Official record
Conditions
Alcohol Drinking, Sex, Unsafe, Hiv
Interventions
Self-Regulation Intervention, Brief Advice and Information
Behavioral
Lead sponsor
Boston University Charles River Campus
Other
Eligibility
18 Years and older · Male only
Enrollment
354 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2023 – 2027
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Jul 19, 2026 · Synced Jul 22, 2026, 2:19 PM EDT
Completed Not applicable Interventional Results available

Testing an Integrated Bio-Behavioral Primary HIV Prevention Intervention Among High-Risk People Who Use Drugs

NCT03282890
View directory record Official record
Conditions
Risk Behavior, HIV/AIDS, Medication Adherence, Substance Abuse
Interventions
CHRP-BB
Other
Lead sponsor
University of Connecticut
Other
Eligibility
18 Years and older
Enrollment
237 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017 – 2023
U.S. locations
1
States / cities
New Haven, Connecticut
Source: ClinicalTrials.gov public record
Updated Aug 16, 2025 · Synced Jul 22, 2026, 2:19 PM EDT
Completed Not applicable Interventional

A Web-based Intervention Study to Reduce High-risk Sexual Behavior by Persons Living With HIV AIDS (PLWH)

NCT01198418
View directory record Official record
Conditions
Sexually Transmitted Infections, HIV Infections
Interventions
Experimental
Behavioral
Lead sponsor
University of California, San Diego
Other
Eligibility
18 Years and older · Male only
Enrollment
181 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2010 – 2017
U.S. locations
3
States / cities
Los Angeles, California • San Diego, California • Torrance, California
Source: ClinicalTrials.gov public record
Updated May 11, 2020 · Synced Jul 22, 2026, 2:19 PM EDT
Not listed Not applicable Interventional

Telephone Counseling to Enhance the Quality and Safety of Romantic and Sexual Relationships in People Living and Aging With HIV

NCT03004170
View directory record Official record
Conditions
HIV Seropositivity
Interventions
Telephone-Administered Motivational Interviewing Plus Behavioral Skills Training, Telephone-Administered Coping Effectiveness Training
Behavioral
Lead sponsor
Oregon Health and Science University
Other
Eligibility
50 Years and older
Enrollment
343 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2016 – 2021
U.S. locations
1
States / cities
Portland, Oregon
Source: ClinicalTrials.gov public record
Updated Apr 8, 2021 · Synced Jul 22, 2026, 2:19 PM EDT
Terminated Phase 2 Interventional Results available

Prophylactic White Cell Transfusions Versus Therapeutic White Cell Transfusions in Patients With Leukemia

NCT01204788
View directory record Official record
Conditions
Leukemia
Interventions
Prophylactic White Cell Transfusion, Therapeutic White Cell Transfusion
Procedure
Lead sponsor
M.D. Anderson Cancer Center
Other
Eligibility
2 Years and older
Enrollment
5 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2010 – 2013
U.S. locations
1
States / cities
Houston, Texas
Source: ClinicalTrials.gov public record
Updated Jun 9, 2015 · Synced Jul 22, 2026, 2:19 PM EDT
Completed Phase 2 Interventional Accepts healthy volunteers Results available

A Peer-Oriented HIV Prevention Outreach Program for Individuals at High Risk for HIV and Other STIs

NCT00183456
View directory record Official record
Conditions
HIV Infections, Sexually Transmitted Diseases
Interventions
Peer-oriented intervention, Group cognitive behavioral therapy (CBT)
Behavioral
Lead sponsor
Johns Hopkins Bloomberg School of Public Health
Other
Eligibility
18 Years to 74 Years
Enrollment
746 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2005 – 2009
U.S. locations
1
States / cities
Baltimore, Maryland
Source: ClinicalTrials.gov public record
Updated Jun 27, 2013 · Synced Jul 22, 2026, 2:19 PM EDT