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Showing 1–24 of 205 matching trials from the live ClinicalTrials.gov search.
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Filters: Intervention: Harm Reduction Clear all
Completed Phase 2Phase 3 Interventional Accepts healthy volunteers

Preventing Drug Use in Low Income Clinic Populations

NCT01942876
View directory record Official record
Conditions
Drug Use, Harmful Use
Interventions
Quit Using Drugs Intervention Trial, Health behavior maintenance
Behavioral
Lead sponsor
University of California, Los Angeles
Other
Eligibility
18 Years and older
Enrollment
411 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2011 – 2013
U.S. locations
1
States / cities
Los Angeles, California
Source: ClinicalTrials.gov public record
Updated Nov 17, 2016 · Synced Sep 3, 2026, 2:46 AM EDT
Completed Not applicable Interventional Results available

E-cigarettes for Harm Reduction in Adults With Asthma

NCT05278065
View directory record Official record
Conditions
Smoking, Asthma, Electronic Cigarette Use, Cigarette Smoking
Interventions
Nicotine
Other
Lead sponsor
Brown University
Other
Eligibility
21 Years to 65 Years
Enrollment
17 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2022 – 2024
U.S. locations
1
States / cities
Providence, Rhode Island
Source: ClinicalTrials.gov public record
Updated Nov 17, 2025 · Synced Sep 3, 2026, 2:46 AM EDT
Recruiting Not applicable Interventional Accepts healthy volunteers

Data2Action Oregon Project: Supporting Data-driven Decision-Making for Substance Use Services, Policy, and Overdose Prevention

NCT06852170
View directory record Official record
Conditions
Substance Abuse, Decision Making, Shared, Implementation Science, Decision Making, Organizations, Substance-related Disorders, Policy
Interventions
Co-Design Sessions (CDS), Data products
Other
Lead sponsor
Chestnut Health Systems
Other
Eligibility
18 Years and older
Enrollment
341 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2025 – 2028
U.S. locations
1
States / cities
Eugene, Oregon
Source: ClinicalTrials.gov public record
Updated Mar 15, 2026 · Synced Sep 3, 2026, 2:46 AM EDT
Completed Not applicable Interventional Results available

Ending Transmission of HIV, HCV, and STDs and Overdose in Rural Communities of People Who Inject Drugs (ETHIC)

NCT04427202
View directory record Official record
Conditions
HIV, Hepatitis C, Opioid-use Disorder, Injection Drug Use
Interventions
Referral to harm reduction services
Behavioral
Lead sponsor
University of Chicago
Other
Eligibility
15 Years and older
Enrollment
306 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2023
U.S. locations
2
States / cities
Carbondale, Illinois • Murphysboro, Illinois
Source: ClinicalTrials.gov public record
Updated Dec 11, 2024 · Synced Sep 3, 2026, 2:46 AM EDT
Recruiting No phase listed Observational

Shelter HArm Reduction Evaluation

NCT07170072
View directory record Official record
Conditions
Overdose, Harm Reduction
Interventions
Not listed
Lead sponsor
NYU Langone Health
Other
Eligibility
18 Years and older
Enrollment
80 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2025 – 2027
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Aug 24, 2026 · Synced Sep 3, 2026, 2:46 AM EDT
Withdrawn Phase 4 Interventional

Elimination of HCV Through Linkage and In Prison Treatment of Incarcerated Populations (ECLIPSE)

NCT04235049
View directory record Official record
Conditions
HCV Infection
Interventions
Glecaprevir/pibrentasvir
Drug
Lead sponsor
University of Maryland, Baltimore
Other
Eligibility
18 Years and older
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2024
U.S. locations
1
States / cities
Baltimore, Maryland
Source: ClinicalTrials.gov public record
Updated May 5, 2021 · Synced Sep 3, 2026, 2:46 AM EDT
Active, not recruiting Not applicable Interventional Accepts healthy volunteers

Motivational Interviewing to Increase Uptake of Drug Checking and Safe Drug Use Behaviors to Reduce Overdose

NCT06855836
View directory record Official record
Conditions
Overdose
Interventions
MI-CHANCE (TS + FTIR + MI), TS + FTIR + Flu and Hepatitis A Education
Behavioral
Lead sponsor
University of California, San Diego
Other
Eligibility
18 Years and older
Enrollment
588 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2025 – 2029
U.S. locations
1
States / cities
San Diego, California
Source: ClinicalTrials.gov public record
Updated Apr 5, 2026 · Synced Sep 3, 2026, 2:46 AM EDT
Recruiting Not applicable Interventional

E-cigarettes for Harm Reduction Among Smokers With Serious Mental Illness

NCT05815199
View directory record Official record
Conditions
Cigarette Smoking
Interventions
E-cigarette (EC), Nicotine Replacement Therapy (NRT), Harm-Reduction Counseling, Ecological Momentary Intervention (EMI) Text Messaging
Other · Behavioral
Lead sponsor
NYU Langone Health
Other
Eligibility
21 Years and older
Enrollment
60 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2023 – 2026
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Oct 9, 2025 · Synced Sep 3, 2026, 2:46 AM EDT
Completed Not applicable Interventional Results available

Accessible HCV Care Intervention for People Who Inject Illicit Drugs (PWID)

NCT03214679
View directory record Official record
Conditions
Hepatitis C, People Who Inject Drugs, PWID, HCV Coinfection
Interventions
Accessible Care, Usual Care
Other
Lead sponsor
City University of New York, School of Public Health
Other
Eligibility
18 Years and older
Enrollment
167 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017 – 2021
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Feb 21, 2023 · Synced Sep 3, 2026, 2:46 AM EDT
Completed Phase 2 Interventional Accepts healthy volunteers

Comparisons of Nicotine-free Cigarettes, Extra Low Nicotine Cigarettes vs. Medicinal Nicotine

NCT00777569
View directory record Official record
Conditions
Tobacco Dependence
Interventions
Nicotine free cigarettes, Extra-low nicotine cigarettes, Nicotine Lozenge
Drug
Lead sponsor
National Institute on Drug Abuse (NIDA)
NIH
Eligibility
18 Years to 70 Years
Enrollment
66 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2005 – 2006
U.S. locations
1
States / cities
Minneapolis, Minnesota
Source: ClinicalTrials.gov public record
Updated Jan 15, 2017 · Synced Sep 3, 2026, 2:46 AM EDT
Completed Not applicable Interventional

PLUS PINK: HHRP+ Adaptation for Women With HIV Under Community Supervision

NCT03175094
View directory record Official record
Conditions
HIV
Interventions
Holistic Health Recovery Program for HIV+
Behavioral
Lead sponsor
Yale University
Other
Eligibility
18 Years and older · Female only
Enrollment
90 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2015 – 2017
U.S. locations
1
States / cities
New Haven, Connecticut
Source: ClinicalTrials.gov public record
Updated Aug 3, 2021 · Synced Sep 3, 2026, 2:46 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Feasibility of a Decision Aid for E-Cigarettes in Primary Care

NCT03836573
View directory record Official record
Conditions
Smoking, Cigarette, Smoking Cessation
Interventions
Smoking Cessation iPad Decision Aid Tool
Behavioral
Lead sponsor
University of Florida
Other
Eligibility
18 Years to 100 Years
Enrollment
120 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2019
U.S. locations
1
States / cities
Gainesville, Florida
Source: ClinicalTrials.gov public record
Updated Aug 21, 2019 · Synced Sep 3, 2026, 2:46 AM EDT
Recruiting Phase 2 Interventional

Safe Treatment for Emergency Presentation for Suicidal Ideation and Behavior in Youth

NCT05304065
View directory record Official record
Conditions
Suicide, Suicidal, Self-Harm
Interventions
SAFETY-A within usual ED Care, Combined SAFETY-A within usual ED Care + CLASP Therapeutic Follow-Up Contacts
Behavioral
Lead sponsor
University of California, Los Angeles
Other
Eligibility
13 Years to 24 Years
Enrollment
1,600 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2022 – 2026
U.S. locations
5
States / cities
Los Angeles, California • Sylmar, California • Durham, North Carolina + 2 more
Source: ClinicalTrials.gov public record
Updated Dec 30, 2025 · Synced Sep 3, 2026, 2:46 AM EDT
Recruiting Phase 2Phase 3 Interventional Accepts healthy volunteers

Naltrexone for Overdose Prevention

NCT06633900
View directory record Official record
Conditions
Overdose Accidental
Interventions
IM naltrexone, Usual Care
Drug · Behavioral
Lead sponsor
University of California, San Francisco
Other
Eligibility
18 Years and older
Enrollment
100 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2025 – 2027
U.S. locations
1
States / cities
San Francisco, California
Source: ClinicalTrials.gov public record
Updated Jun 8, 2026 · Synced Sep 3, 2026, 2:46 AM EDT
Enrolling by invitation Not applicable Interventional Accepts healthy volunteers

Clinical Alternatives for Reducing Harm Using E-cigarettes

NCT07039292
View directory record Official record
Conditions
Smoking, E-Cig Use, Oncology
Interventions
Harm Reduction (E-cigarette switching), Standard of Care
Behavioral
Lead sponsor
Medical University of South Carolina
Other
Eligibility
21 Years and older
Enrollment
208 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2025 – 2029
U.S. locations
1
States / cities
Charleston, South Carolina
Source: ClinicalTrials.gov public record
Updated May 7, 2026 · Synced Sep 3, 2026, 2:46 AM EDT
Active, not recruiting Not applicable Interventional

Peer Engagement in Methamphetamine Harm-Reduction With Contingency Management (PEER-CM)

NCT05700994
View directory record Official record
Conditions
Methamphetamine Abuse
Interventions
Peer Contingency Management, Standard of Care Contingency Management
Behavioral
Lead sponsor
Oregon Health and Science University
Other
Eligibility
18 Years to 105 Years
Enrollment
1,283 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2023 – 2026
U.S. locations
2
States / cities
Portland, Oregon
Source: ClinicalTrials.gov public record
Updated Jan 13, 2026 · Synced Sep 3, 2026, 2:46 AM EDT
Completed No phase listed Observational Accepts healthy volunteers

Cannabis Observational Study on Mood, Inflammation, and Cognition

NCT03522103
View directory record Official record
Conditions
Inflammation, Inflammatory Response, Mood, Cognitive Change
Interventions
Not listed
Lead sponsor
University of Colorado, Denver
Other
Eligibility
21 Years to 70 Years
Enrollment
421 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2016 – 2020
U.S. locations
1
States / cities
Aurora, Colorado
Source: ClinicalTrials.gov public record
Updated Jul 11, 2021 · Synced Sep 3, 2026, 2:46 AM EDT
Withdrawn Not applicable Interventional Accepts healthy volunteers

Cigarette Harm Reduction With Electronic Cigarette Use

NCT03473483
View directory record Official record
Conditions
Nicotine Dependence, Tobacco Toxicity, Nicotine Dependence, Cigarettes, Cardiovascular Risk Factor, Nicotine Withdrawal
Interventions
SREC
Other
Lead sponsor
University of California, San Francisco
Other
Eligibility
21 Years to 70 Years
Healthy volunteers
Accepts healthy volunteers
Timeline
2022 – 2026
U.S. locations
1
States / cities
San Francisco, California
Source: ClinicalTrials.gov public record
Updated Dec 8, 2022 · Synced Sep 3, 2026, 2:46 AM EDT
Not yet recruiting Not applicable Interventional

A Social Network Approach to Improve HIV Prevention and Substance Use Treatment For People Who Use Drugs

NCT07409350
View directory record Official record
Conditions
Substance Use, HIV Prevention
Interventions
LINKED, Group Intervention
Behavioral
Lead sponsor
NYU Langone Health
Other
Eligibility
18 Years and older
Enrollment
398 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2027 – 2028
U.S. locations
3
States / cities
Los Angeles, California • Chicago, Illinois • New York, New York
Source: ClinicalTrials.gov public record
Updated Feb 12, 2026 · Synced Sep 3, 2026, 2:46 AM EDT
Completed Not applicable Interventional Results available

THRIVE: Culturally AdapTed Harm Reduction Intervention

NCT06609278
View directory record Official record
Conditions
Opioid Use, Stimulant Use
Interventions
harm reduction intervention
Behavioral
Lead sponsor
Brittany Miller-Roenigk
Other
Eligibility
18 Years to 65 Years
Enrollment
63 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2025
U.S. locations
3
States / cities
Louisville, Kentucky • Cincinnati, Ohio
Source: ClinicalTrials.gov public record
Updated Jun 29, 2026 · Synced Sep 3, 2026, 2:46 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Rigorous Evaluation of High School FLASH

NCT04079608
View directory record Official record
Conditions
Pregnancy Related, Sexual Behavior, STD
Interventions
FLASH curriculum, Sexual Health Education for Adolescents
Behavioral
Lead sponsor
ETR Associates
Other
Eligibility
14 Years to 18 Years
Enrollment
1,597 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2016 – 2019
U.S. locations
1
States / cities
Scotts Valley, California
Source: ClinicalTrials.gov public record
Updated Sep 10, 2019 · Synced Sep 3, 2026, 2:46 AM EDT
Withdrawn Phase 1Phase 2 Interventional

Preoperative PRRT Versus Surgical Cytoreduction in Metastatic Pancreatic Neuroendocrine Tumors to the Liver

NCT05610826
View directory record Official record
Conditions
Pancreatic Neuroendocrine Tumor, Pancreas Cancer
Interventions
cytoreductive surgery, Lutathera - a small molecule used in Peptide Receptor Radionuclide Therapy (PRRT), Peptide receptor radionuclide therapy (PRRT)
Procedure · Drug
Lead sponsor
University of Chicago
Other
Eligibility
18 Years and older
Healthy volunteers
Healthy volunteers not accepted
Timeline
2023 – 2024
U.S. locations
1
States / cities
Chicago, Illinois
Source: ClinicalTrials.gov public record
Updated Oct 25, 2024 · Synced Sep 3, 2026, 2:46 AM EDT
Recruiting Not applicable Interventional Accepts healthy volunteers

Trial of a Harm Reduction Strategy for People With HIV Who Smoke Cigarettes

NCT05642715
View directory record Official record
Conditions
Hiv, Tobacco Use
Interventions
EX+, Varenicline, HR, TAU
Behavioral · Drug
Lead sponsor
Montefiore Medical Center
Other
Eligibility
40 Years to 79 Years
Enrollment
400 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2024 – 2027
U.S. locations
1
States / cities
The Bronx, New York
Source: ClinicalTrials.gov public record
Updated Apr 20, 2026 · Synced Sep 3, 2026, 2:46 AM EDT
Recruiting Not applicable Interventional Accepts healthy volunteers

Noncombustible Nicotine Delivery Systems as Potential Harm Reduction Tools for Persistent Cigarette Smokers

NCT06372899
View directory record Official record
Conditions
E-cigarette Use, Cigarette Smoking, Harm Reduction, Tobacco Use
Interventions
E-cigarettes, Oral nicotine pouches
Other
Lead sponsor
Abramson Cancer Center at Penn Medicine
Other
Eligibility
21 Years and older
Enrollment
200 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2024 – 2028
U.S. locations
1
States / cities
Philadelphia, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Mar 11, 2026 · Synced Sep 3, 2026, 2:46 AM EDT