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ClinicalTrials.gov public records Last synced May 21, 2026, 10:10 PM EDT

Data is sourced from official ClinicalTrials.gov public API records. Always review the official ClinicalTrials.gov record for the latest information.

Showing 25–48 of 24 matching trials from the live ClinicalTrials.gov search.
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Filters: Condition: Acetaminophen Clear all
Withdrawn Not applicable Interventional Accepts healthy volunteers
View directory record Official record
Conditions
Pharmacokinetics
Interventions
Acetaminophen
Drug
Lead sponsor
University of Texas Southwestern Medical Center
Other
Eligibility
18 Years to 45 Years
Healthy volunteers
Accepts healthy volunteers
Timeline
2009
U.S. locations
1
States / cities
Dallas, Texas
Source: ClinicalTrials.gov public record
Updated Jan 21, 2019 · Synced May 21, 2026, 10:10 PM EDT
Completed Phase 1 Interventional Accepts healthy volunteers
View directory record Official record
Conditions
Healthy
Interventions
Oxybutynin Chloride Gel, Placebo Gel
Drug
Lead sponsor
Watson Pharmaceuticals
Industry
Eligibility
18 Years and older · Female only
Enrollment
23 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2009
U.S. locations
1
States / cities
Saint Charles, Missouri
Source: ClinicalTrials.gov public record
Updated Oct 7, 2012 · Synced May 21, 2026, 10:10 PM EDT
Recruiting Phase 2 Interventional
View directory record Official record
Conditions
Pain, Postoperative, Osteoarthritis Thumb
Interventions
NSAID capsules, Opioid capsule
Drug
Lead sponsor
Stanford University
Other
Eligibility
45 Years and older
Enrollment
121 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2027
U.S. locations
2
States / cities
Redwood City, California • Salt Lake City, Utah
Source: ClinicalTrials.gov public record
Updated Aug 5, 2025 · Synced May 21, 2026, 10:10 PM EDT
Completed Phase 3 Interventional Results available
View directory record Official record
Conditions
Pain
Interventions
Acetaminophen, Placebo Control
Drug
Lead sponsor
McNeil Consumer Healthcare Division of McNEIL-PPC, Inc.
Industry
Eligibility
16 Years to 50 Years
Enrollment
540 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2010 – 2011
U.S. locations
1
States / cities
Salt Lake City, Utah
Source: ClinicalTrials.gov public record
Updated May 27, 2012 · Synced May 21, 2026, 10:10 PM EDT
Completed Phase 2 Interventional
View directory record Official record
Conditions
Migraine With or Without Aura
Interventions
Naltrexone and Acetaminophen, Naltrexone and Acetaminophen-High Dose, Naltrexone Alone (regular dose), Acetaminophen Alone, Matching Placebo
Drug
Lead sponsor
Allodynic Therapeutics, Inc
Industry
Eligibility
18 Years and older
Enrollment
92 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017 – 2018
U.S. locations
1
States / cities
North Miami, Florida
Source: ClinicalTrials.gov public record
Updated Feb 6, 2024 · Synced May 21, 2026, 10:10 PM EDT
Withdrawn Phase 2 Interventional
View directory record Official record
Conditions
Arnold-Chiari Malformation, Posterior Fossa Tumors
Interventions
IV acetaminophen, normal saline
Drug
Lead sponsor
Children's National Research Institute
Other
Eligibility
2 Years to 12 Years
Healthy volunteers
Healthy volunteers not accepted
Timeline
2015 – 2018
U.S. locations
1
States / cities
Washington D.C., District of Columbia
Source: ClinicalTrials.gov public record
Updated Apr 7, 2021 · Synced May 21, 2026, 10:10 PM EDT
Completed Phase 2 Interventional
View directory record Official record
Conditions
Chronic Low Back Pain, Lumbar Radiculopathy
Interventions
Low-dose naltrexone and acetaminophen combination, Placebo
Drug
Lead sponsor
Allodynic Therapeutics, Inc
Industry
Eligibility
18 Years and older
Enrollment
12 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017 – 2018
U.S. locations
1
States / cities
North Miami, Florida
Source: ClinicalTrials.gov public record
Updated Apr 13, 2021 · Synced May 21, 2026, 10:10 PM EDT
Completed Phase 3 Interventional
View directory record Official record
Conditions
Moderate to Severe Chronic, Non-malignant Pain
Interventions
Hydrocodone/Acetaminophen on Extended Release
Drug
Lead sponsor
Abbott
Industry
Eligibility
21 Years to 75 Years
Enrollment
431 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2005 – 2006
U.S. locations
76
States / cities
Huntsville, Alabama • Chandler, Arizona • Mesa, Arizona + 60 more
Source: ClinicalTrials.gov public record
Updated Jan 18, 2011 · Synced May 21, 2026, 10:10 PM EDT
Recruiting Phase 4 Interventional
View directory record Official record
Conditions
Surgery, Pain, Postoperative
Interventions
NSAID, Opioid, Acetaminophen
Drug
Lead sponsor
University of Michigan
Other
Eligibility
18 Years and older
Enrollment
900 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2023 – 2027
U.S. locations
6
States / cities
Ann Arbor, Michigan • Detroit, Michigan • St Louis, Missouri + 3 more
Source: ClinicalTrials.gov public record
Updated Apr 16, 2026 · Synced May 21, 2026, 10:10 PM EDT
Withdrawn Phase 4 Interventional Accepts healthy volunteers
View directory record Official record
Conditions
Headache
Interventions
Ketorolac, Acetaminophen
Drug
Lead sponsor
Corewell Health South
Other
Eligibility
18 Years to 65 Years
Healthy volunteers
Accepts healthy volunteers
Timeline
2017 – 2020
U.S. locations
1
States / cities
Saint Joseph, Michigan
Source: ClinicalTrials.gov public record
Updated Nov 28, 2024 · Synced May 21, 2026, 10:10 PM EDT
Withdrawn Phase 3 Interventional
View directory record Official record
Conditions
Pain, Hip Fracture
Interventions
Placebo, Acetaminophen IV
Drug
Lead sponsor
Lancaster General Hospital
Other
Eligibility
65 Years and older
Healthy volunteers
Healthy volunteers not accepted
Timeline
2011 – 2013
U.S. locations
1
States / cities
Lancaster, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Sep 29, 2014 · Synced May 21, 2026, 10:10 PM EDT
Not yet recruiting No phase listed Observational
View directory record Official record
Conditions
Multiple Sclerosis
Interventions
1000mg acetaminophen or placebo
Drug
Lead sponsor
Hunter College of City University of New York
Other
Eligibility
18 Years to 65 Years
Enrollment
20 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2026
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Mar 16, 2026 · Synced May 21, 2026, 10:10 PM EDT
Recruiting Phase 4 Interventional
View directory record Official record
Conditions
Pain, Postoperative
Interventions
Ibuprofen, Acetominophen
Drug
Lead sponsor
Boston University
Other
Eligibility
4 Years to 6 Years
Enrollment
75 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2025 – 2027
U.S. locations
1
States / cities
Brighton, Massachusetts
Source: ClinicalTrials.gov public record
Updated Apr 1, 2026 · Synced May 21, 2026, 10:10 PM EDT
Terminated Phase 3 Interventional
View directory record Official record
Conditions
Post Operative Pain, Post Operative Nausea and Vomiting
Interventions
IV acetaminophen, placebo
Drug
Lead sponsor
MercyOne Des Moines Medical Center
Other
Eligibility
18 Years and older · Female only
Enrollment
82 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2013 – 2017
U.S. locations
1
States / cities
Des Moines, Iowa
Source: ClinicalTrials.gov public record
Updated Jan 13, 2020 · Synced May 21, 2026, 10:10 PM EDT
Completed Not applicable Interventional
View directory record Official record
Conditions
Acute Pain, Surgery
Interventions
Prescription by surgical team, Recommendation by surgical team
Other
Lead sponsor
University of Michigan
Other
Eligibility
18 Years and older
Enrollment
250 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2022 – 2024
U.S. locations
1
States / cities
Ann Arbor, Michigan
Source: ClinicalTrials.gov public record
Updated Dec 10, 2024 · Synced May 21, 2026, 10:10 PM EDT
Not yet recruiting Phase 4 Interventional
View directory record Official record
Conditions
Postoperative Pain
Interventions
Acetaminophen Oral Tablet, placebo oral tablet, Acetaminophen infusion, Placebo infusion
Drug
Lead sponsor
Stanford University
Other
Eligibility
18 Years and older
Enrollment
180 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2026 – 2027
U.S. locations
1
States / cities
Stanford, California
Source: ClinicalTrials.gov public record
Updated Oct 7, 2025 · Synced May 21, 2026, 10:10 PM EDT
Withdrawn Phase 4 Interventional
View directory record Official record
Conditions
Postoperative Pain, Intraoperative and Postoperative Opioid Requirements
Interventions
Intravenous acetaminophen, Intravenous placebo
Drug
Lead sponsor
University of California, San Diego
Other
Eligibility
18 Years and older
Healthy volunteers
Healthy volunteers not accepted
U.S. locations
1
States / cities
San Diego, California
Source: ClinicalTrials.gov public record
Updated Mar 7, 2012 · Synced May 21, 2026, 10:10 PM EDT
Terminated Phase 4 Interventional Results available
View directory record Official record
Conditions
Subarachnoid Hemorrhage, Stroke
Interventions
IV acetaminophen, Oral acetaminophen, Oral placebo, IV placebo
Drug
Lead sponsor
Milton S. Hershey Medical Center
Other
Eligibility
18 Years and older
Enrollment
3 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017 – 2018
U.S. locations
1
States / cities
Hershey, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Apr 9, 2019 · Synced May 21, 2026, 10:10 PM EDT
Completed Phase 3 Interventional Results available
View directory record Official record
Conditions
Acute Pain, Fever
Interventions
IV Acetaminophen
Drug
Lead sponsor
Mallinckrodt
Industry
Eligibility
18 Years to 85 Years
Enrollment
213 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2008
U.S. locations
14
States / cities
Arcadia, California • Glendale, California • Laguna Hills, California + 10 more
Source: ClinicalTrials.gov public record
Updated Oct 20, 2016 · Synced May 21, 2026, 10:10 PM EDT
Recruiting Not applicable Interventional
View directory record Official record
Conditions
Crohn's Disease (CD), Dysmenorrhea Primary
Interventions
Acetaminophen, Ibuprofen
Other
Lead sponsor
University of North Carolina, Chapel Hill
Other
Eligibility
18 Years to 44 Years · Female only
Enrollment
24 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2026 – 2028
U.S. locations
1
States / cities
Chapel Hill, North Carolina
Source: ClinicalTrials.gov public record
Updated Mar 22, 2026 · Synced May 21, 2026, 10:10 PM EDT
Completed Phase 2 Interventional Results available
View directory record Official record
Conditions
Pain Management
Interventions
Ibuprofen, APAP
Drug
Lead sponsor
Antonios Likourezos
Other
Eligibility
3 Years to 17 Years
Enrollment
90 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018 – 2020
U.S. locations
1
States / cities
Brooklyn, New York
Source: ClinicalTrials.gov public record
Updated Mar 24, 2021 · Synced May 21, 2026, 10:10 PM EDT
Completed No phase listed Observational Accepts healthy volunteers
View directory record Official record
Conditions
Acetaminophen-protein Adduct Formation
Interventions
Not listed
Lead sponsor
Denver Health and Hospital Authority
Other
Eligibility
18 Years and older
Enrollment
100 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2009 – 2011
U.S. locations
2
States / cities
Aurora, Colorado • Denver, Colorado
Source: ClinicalTrials.gov public record
Updated Aug 7, 2012 · Synced May 21, 2026, 10:10 PM EDT
Completed Not applicable Interventional
View directory record Official record
Conditions
Opioid Use, Unspecified
Interventions
Additional Opioid Information
Behavioral
Lead sponsor
Northwestern University
Other
Eligibility
18 Years and older
Enrollment
278 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2012 – 2013
U.S. locations
1
States / cities
Chicago, Illinois
Source: ClinicalTrials.gov public record
Updated Aug 19, 2019 · Synced May 21, 2026, 10:10 PM EDT
Withdrawn Phase 2Phase 3 Interventional Accepts healthy volunteers
View directory record Official record
Conditions
Post Operative Pain
Interventions
Acetaminophen, Placebo
Drug
Lead sponsor
Montefiore Medical Center
Other
Eligibility
18 Years to 100 Years · Female only
Healthy volunteers
Accepts healthy volunteers
Timeline
2020 – 2021
U.S. locations
1
States / cities
The Bronx, New York
Source: ClinicalTrials.gov public record
Updated Aug 17, 2022 · Synced May 21, 2026, 10:10 PM EDT