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ClinicalTrials.gov public records Last synced Oct 20, 2026, 6:15 AM EDT

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Showing 1–18 of 18 matching trials from the live ClinicalTrials.gov search.
Filters: Condition: Opioid Tolerance Clear all
Completed Phase 2 Interventional Accepts healthy volunteers

Differential Acute Tolerance Development to Effects of Nitrous Oxide - 7

NCT00000255
View directory record Official record
Conditions
Opioid-Related Disorders, Substance-Related Disorders
Interventions
Nitrous oxide
Drug
Lead sponsor
University of Chicago
Other
Eligibility
21 Years to 37 Years
Enrollment
10 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
1995 – 1996
U.S. locations
1
States / cities
Chicago, Illinois
Source: ClinicalTrials.gov public record
Updated May 28, 2015 · Synced Oct 20, 2026, 6:15 AM EDT
Completed No phase listed Observational

Opioid Physiology Project

NCT03462797
View directory record Official record
Conditions
Tolerance, Withdrawal, Addiction, Epigenetic Changes
Interventions
Not listed
Lead sponsor
University of Tennessee
Other
Eligibility
18 Years and older
Enrollment
87 participants
Timeline
2017 – 2018
U.S. locations
1
States / cities
Memphis, Tennessee
Source: ClinicalTrials.gov public record
Updated Oct 11, 2018 · Synced Oct 20, 2026, 6:15 AM EDT
Completed Phase 2 Interventional Results available

Benzodiazepine Discontinuation in Opioid Agonist Therapy

NCT04109118
View directory record Official record
Conditions
Substance Use Disorders
Interventions
Distress Tolerance - Benzodiazepine Discontinuation (DT-BD), BZD discontinuation protocol
Behavioral · Drug
Lead sponsor
Boston Medical Center
Other
Eligibility
18 Years and older
Enrollment
4 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Feb 11, 2022 · Synced Oct 20, 2026, 6:15 AM EDT
Completed No phase listed Observational

Safety and Efficacy of a Low Dose Naloxone Infusion in NICU Patients

NCT00669175
View directory record Official record
Conditions
Opioid Tolerance, Pain
Interventions
Not listed
Lead sponsor
Children's Mercy Hospital Kansas City
Other
Eligibility
1 Day to 30 Days
Enrollment
25 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2008 – 2011
U.S. locations
1
States / cities
Kansas City, Missouri
Source: ClinicalTrials.gov public record
Updated Jul 21, 2011 · Synced Oct 20, 2026, 6:15 AM EDT
Completed Not applicable Interventional

Evolution of Analgesic Tolerance With Opioids

NCT00275249
View directory record Official record
Conditions
Chronic Pain
Interventions
levorphanol
Drug
Lead sponsor
University of California, San Francisco
Other
Eligibility
21 Years to 80 Years
Enrollment
60 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2001 – 2005
U.S. locations
1
States / cities
San Francisco, California
Source: ClinicalTrials.gov public record
Updated Apr 14, 2011 · Synced Oct 20, 2026, 6:15 AM EDT
Terminated Not applicable Interventional

Distress Tolerance for Benzodiazepine Discontinuation

NCT05250570
View directory record Official record
Conditions
Substance Use Disorders
Interventions
Distress Tolerance - Benzodiazepine Discontinuation (DT-BD), Relaxation Therapy
Behavioral
Lead sponsor
University of Pittsburgh
Other
Eligibility
18 Years and older
Enrollment
1 participant
Healthy volunteers
Healthy volunteers not accepted
Timeline
2022
U.S. locations
3
States / cities
Pittsburgh, Pennsylvania • Wilkinsburg, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Jan 30, 2023 · Synced Oct 20, 2026, 6:15 AM EDT
Completed Phase 2 Interventional Accepts healthy volunteers

Lack of Acute Tolerance Development to Effects of Nitrous Oxide - 4

NCT00000252
View directory record Official record
Conditions
Opioid-Related Disorders, Substance-Related Disorders
Interventions
0% N2O, 10% N2O, 20% N2O, 30% N2O, 40% N2O
Drug
Lead sponsor
University of Chicago
Other
Eligibility
21 Years to 29 Years
Enrollment
11 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
1994 – 1996
U.S. locations
1
States / cities
Chicago, Illinois
Source: ClinicalTrials.gov public record
Updated May 28, 2015 · Synced Oct 20, 2026, 6:15 AM EDT
Not listed Not applicable Interventional

Cryoablation of Intercostal Nerves for Post-Operative Pain Management in Opioid-Tolerant Patients

NCT05276258
View directory record Official record
Conditions
Pain, Pain, Postoperative
Interventions
cryoSPHERE Ablation, Bupivacaine
Device · Drug
Lead sponsor
The Methodist Hospital Research Institute
Other
Eligibility
18 Years to 90 Years
Enrollment
75 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2023 – 2025
U.S. locations
1
States / cities
Houston, Texas
Source: ClinicalTrials.gov public record
Updated Mar 24, 2023 · Synced Oct 20, 2026, 6:15 AM EDT
Completed Phase 4 Interventional Results available

Low Dose Ketamine Study on Opioid Tolerance and Hyperalgesia

NCT01325493
View directory record Official record
Conditions
Idiopathic Scoliosis, Spondylolisthesis
Interventions
Ketamine, Normal Saline
Drug
Lead sponsor
Julia Finkel
Other
Eligibility
10 Years to 18 Years
Enrollment
54 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2010 – 2012
U.S. locations
1
States / cities
Washington D.C., District of Columbia
Source: ClinicalTrials.gov public record
Updated Jan 14, 2016 · Synced Oct 20, 2026, 6:15 AM EDT
Completed Phase 3 Interventional

Distress Tolerance and Buprenorphine

NCT01556087
View directory record Official record
Conditions
Opioid Dependence
Interventions
Distress Tolerance, Health Education
Behavioral
Lead sponsor
Butler Hospital
Other
Eligibility
18 Years to 75 Years
Enrollment
59 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2012 – 2015
U.S. locations
1
States / cities
Providence, Rhode Island
Source: ClinicalTrials.gov public record
Updated Sep 10, 2015 · Synced Oct 20, 2026, 6:15 AM EDT
Terminated Phase 4 Interventional Results available

Effect of Guanfacine on Opioid-induced Hyperalgesia (OIH) and Tolerance

NCT01681264
View directory record Official record
Conditions
Chronic Pain
Interventions
Morphine, Guanfacine 1mg, Guanfacine 2mg, Placebo
Drug
Lead sponsor
Massachusetts General Hospital
Other
Eligibility
18 Years to 65 Years
Enrollment
137 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2014 – 2023
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Jul 31, 2026 · Synced Oct 20, 2026, 6:15 AM EDT
Completed Phase 4 Interventional

Opiate-Induced Tolerance & Hyperalgesia in Pain Patients

NCT00246532
View directory record Official record
Conditions
Chronic Low Back Pain, Opioid-induced Hyperalgesia
Interventions
Morphine, Placebo
Drug
Lead sponsor
National Institute of General Medical Sciences (NIGMS)
NIH
Eligibility
18 Years to 70 Years
Enrollment
139 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2005 – 2009
U.S. locations
1
States / cities
Stanford, California
Source: ClinicalTrials.gov public record
Updated Apr 30, 2012 · Synced Oct 20, 2026, 6:15 AM EDT
Completed Phase 2 Interventional

Effects of Dextromethorphan on Opioid Tolerance in Methadone Patients - 1

NCT00000352
View directory record Official record
Conditions
Opioid-Related Disorders, Substance-Related Disorders
Interventions
Dextromethorphan
Drug
Lead sponsor
National Institute on Drug Abuse (NIDA)
NIH
Eligibility
21 Years to 55 Years
Healthy volunteers
Healthy volunteers not accepted
Timeline
1996 – 1998
U.S. locations
1
States / cities
Philadelphia, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Jan 12, 2017 · Synced Oct 20, 2026, 6:15 AM EDT
Terminated No phase listed Observational

Opioid Induced Loss of Local Anesthetic Potency in Patients Undergoing Total Knee Arthroplasty

NCT03294174
View directory record Official record
Conditions
Opioid Tolerance, Opioid Naive, Opioid Exposure
Interventions
Ropivacaine injection
Drug
Lead sponsor
University of Pittsburgh
Other
Eligibility
18 Years to 80 Years
Enrollment
48 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
Ends 2017
U.S. locations
1
States / cities
Pittsburgh, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Nov 9, 2018 · Synced Oct 20, 2026, 6:15 AM EDT
Completed Phase 4 Interventional Results available

Diphenhydramine as an Adjunctive Sedative in Patients on Chronic Opioids

NCT01967433
View directory record Official record
Conditions
Colonoscopy, Adjunct Anesthesia Medication
Interventions
Diphenhydramine, Placebo
Drug
Lead sponsor
University of Oklahoma
Other
Eligibility
18 Years to 64 Years
Enrollment
120 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2013 – 2018
U.S. locations
1
States / cities
Oklahoma City, Oklahoma
Source: ClinicalTrials.gov public record
Updated Mar 11, 2020 · Synced Oct 20, 2026, 6:15 AM EDT
Terminated Phase 1 Interventional

Pharmacokinetics of Low Dose Ketamine Infusion

NCT00618397
View directory record Official record
Conditions
Sedation, Opioid Tolerance
Interventions
Ketamine
Drug
Lead sponsor
University of Texas Southwestern Medical Center
Other
Eligibility
3 Years to 18 Years
Enrollment
5 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2006 – 2015
U.S. locations
1
States / cities
Dallas, Texas
Source: ClinicalTrials.gov public record
Updated Oct 26, 2016 · Synced Oct 20, 2026, 6:15 AM EDT
Completed Not applicable Interventional

Distress Tolerance and HIV Prevention With XR-NTX Initiation in Opioid Dependence

NCT02602795
View directory record Official record
Conditions
Opiate Dependence, Sexually Transmitted Diseases, HIV
Interventions
Acceptance and Commitment Therapy, Information Motivation Behavioral Model
Behavioral
Lead sponsor
Rhode Island Hospital
Other
Eligibility
18 Years and older
Enrollment
14 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2015 – 2018
U.S. locations
1
States / cities
Providence, Rhode Island
Source: ClinicalTrials.gov public record
Updated Aug 29, 2018 · Synced Oct 20, 2026, 6:15 AM EDT
Completed Phase 3 Interventional

Impact of Low Dose Naloxone on Fentanyl Requirements in Pediatric ICU Patients

NCT00286052
View directory record Official record
Conditions
Opioid Tolerance
Interventions
Low Dose Naloxone
Drug
Lead sponsor
University of Texas Southwestern Medical Center
Other
Eligibility
1 Day to 18 Years
Enrollment
128 participants
Timeline
2002 – 2004
U.S. locations
1
States / cities
Dallas, Texas
Source: ClinicalTrials.gov public record
Updated Feb 2, 2006 · Synced Oct 20, 2026, 6:15 AM EDT