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Showing 1–24 of 320 matching trials from the live ClinicalTrials.gov search.
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Filters: Condition: Acetaminophen Clear all
Active, not recruiting Phase 3 Interventional Accepts healthy volunteers Results available

Opioid Analgesic Reduction Study

NCT04452344
View directory record Official record
Conditions
Opioid Use
Interventions
opioid-containing analgesic, two over-the-counter analgesics
Drug
Lead sponsor
Rutgers, The State University of New Jersey
Other
Eligibility
18 Years and older
Enrollment
1,815 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2026
U.S. locations
5
States / cities
Chicago, Illinois • Baltimore, Maryland • Ann Arbor, Michigan + 2 more
Source: ClinicalTrials.gov public record
Updated Mar 30, 2026 · Synced Jul 22, 2026, 3:32 AM EDT
Completed Not applicable Interventional Results available

Pain Control After Cardiac Surgery Using Intravenous Acetaminophen

NCT01822821
View directory record Official record
Conditions
Pain
Interventions
IV Acetaminophen, Placebo
Drug
Lead sponsor
The Cleveland Clinic
Other
Eligibility
18 Years to 80 Years
Enrollment
150 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2013 – 2015
U.S. locations
1
States / cities
Cleveland, Ohio
Source: ClinicalTrials.gov public record
Updated May 14, 2017 · Synced Jul 22, 2026, 3:32 AM EDT
Completed Phase 4 Interventional Accepts healthy volunteers Results available

Acute Headache Treatment in Pregnancy: Occipital Nerve Block vs PO Acetaminophen With Caffeine

NCT03951649
View directory record Official record
Conditions
Headache, Pregnancy Related, Occipital Nerve Block
Interventions
Occipital Nerve Block
Drug
Lead sponsor
University of Alabama at Birmingham
Other
Eligibility
16 Years to 60 Years · Female only
Enrollment
62 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020 – 2022
U.S. locations
1
States / cities
Birmingham, Alabama
Source: ClinicalTrials.gov public record
Updated Dec 19, 2023 · Synced Jul 22, 2026, 3:32 AM EDT
Completed Phase 3 Interventional Results available

Study to Evaluate the Analgesic Efficacy and Safety of Hydrocodone Bitartrate/Acetaminophen Immediate-Release Tablets in Participants With Moderate to Severe Pain Following Bunionectomy

NCT02487108
View directory record Official record
Conditions
Pain
Interventions
TV-46763, Placebo
Drug
Lead sponsor
Teva Branded Pharmaceutical Products R&D, Inc.
Industry
Eligibility
18 Years to 75 Years
Enrollment
569 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2015 – 2016
U.S. locations
8
States / cities
Phoenix, Arizona • Anaheim, California • Bakersfield, California + 5 more
Source: ClinicalTrials.gov public record
Updated Mar 30, 2022 · Synced Jul 22, 2026, 3:32 AM EDT
Completed Phase 3 Interventional

A Study of an Acetaminophen/Naproxen Sodium Fixed Combination, Acetaminophen and Naproxen Sodium in Postoperative Dental Pain

NCT05761574
View directory record Official record
Conditions
Pain
Interventions
Acetaminophen/Naproxen Sodium Fixed Combination, Naproxen Sodium, Acetaminophen, Placebo
Drug
Lead sponsor
Johnson & Johnson Consumer Inc. (J&JCI)
Industry
Eligibility
16 Years to 50 Years
Enrollment
447 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2023 – 2024
U.S. locations
1
States / cities
Salt Lake City, Utah
Source: ClinicalTrials.gov public record
Updated Jul 1, 2025 · Synced Jul 22, 2026, 3:32 AM EDT
Completed Not applicable Interventional

Pre-Emptive Analgesia in Ano-Rectal Surgery

NCT02402543
View directory record Official record
Conditions
Hemorrhoids, Fissure in Ano, Rectal Fistula, Anal Condyloma
Interventions
Gabapentin, Ketamine, Acetaminophen, Dexamethasone, Placebo
Drug
Lead sponsor
University of Vermont
Other
Eligibility
18 Years and older
Enrollment
90 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2014 – 2017
U.S. locations
2
States / cities
Burlington, Vermont • Colchester, Vermont
Source: ClinicalTrials.gov public record
Updated Jan 15, 2018 · Synced Jul 22, 2026, 3:32 AM EDT
Completed Early Phase 1 Interventional

Studies of Sulfur Metabolism in Humans

NCT03383133
View directory record Official record
Conditions
Metabolic Side Effects of Drugs
Interventions
SULT Allosteric Inhibition
Drug
Lead sponsor
Albert Einstein College of Medicine
Other
Eligibility
61 Years to 61 Years · Male only
Enrollment
1 participant
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018 – 2023
U.S. locations
1
States / cities
The Bronx, New York
Source: ClinicalTrials.gov public record
Updated Oct 26, 2023 · Synced Jul 22, 2026, 3:32 AM EDT
Completed Phase 4 Interventional Results available

The Efficacy of Intravenous Acetaminophen During Perioperative Neurosurgery Period

NCT01739699
View directory record Official record
Conditions
Craniotomy, Brain Surgery
Interventions
Acetaminophen, Placebo
Drug
Lead sponsor
Endeavor Health
Other
Eligibility
18 Years to 90 Years
Enrollment
140 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2012 – 2017
U.S. locations
1
States / cities
Evanston, Illinois
Source: ClinicalTrials.gov public record
Updated Jun 21, 2026 · Synced Jul 22, 2026, 3:32 AM EDT
Completed Not applicable Interventional

Pragmatic Research of Acupuncture and Counseling eXtended to Inpatient Services

NCT03905720
View directory record Official record
Conditions
Malignant Solid Tumor, Pain
Interventions
Acupuncture, Pain Counseling
Procedure · Behavioral
Lead sponsor
University of California, San Francisco
Other
Eligibility
21 Years and older
Enrollment
448 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2019 – 2021
U.S. locations
2
States / cities
San Francisco, California
Source: ClinicalTrials.gov public record
Updated Oct 21, 2021 · Synced Jul 22, 2026, 3:32 AM EDT
Withdrawn Phase 2 Interventional

Efficacy of Acetaminophen in Posterior Fossa Surgery

NCT02532322
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 Jul 22, 2026, 3:32 AM EDT
Completed Phase 4 Interventional Accepts healthy volunteers Results available

Drug Interactions Between Morphine and Orally or IV Administered Acetaminophen

NCT02848729
View directory record Official record
Conditions
Pain
Interventions
Oral Acetaminophen, IV Acetaminophen, IV Morphine, Placebo Tablets, Saline
Drug
Lead sponsor
Mallinckrodt
Industry
Eligibility
18 Years to 55 Years
Enrollment
50 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2016
U.S. locations
3
States / cities
Tucson, Arizona • Naples, Florida • Kingston, Rhode Island
Source: ClinicalTrials.gov public record
Updated Feb 4, 2020 · Synced Jul 22, 2026, 3:32 AM EDT
Terminated Phase 4 Interventional Results available

Prochlorperazine Versus Acetaminophen, Aspirin, and Caffeine for the Treatment of Acute Migraine

NCT01629329
View directory record Official record
Conditions
Migraine Headaches
Interventions
Aspirin, Acetaminophen, Caffeine pills, Prochlorperazine 10mg
Drug
Lead sponsor
Albert Einstein Healthcare Network
Other
Eligibility
18 Years to 65 Years
Enrollment
93 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2010 – 2014
U.S. locations
1
States / cities
Philadelphia, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Mar 17, 2020 · Synced Jul 22, 2026, 3:32 AM EDT
Completed Phase 2 Interventional Accepts healthy volunteers Results available

A Phase 2 Study to Evaluate Pregabalin and Acetaminophen Compared to Acetaminophen and Placebo in Subjects Undergoing Bunionectomy

NCT04495283
View directory record Official record
Conditions
Postoperative Pain
Interventions
Pregabalin, Acetaminophen, Placebo 1, Placebo 2
Drug · Other
Lead sponsor
Nevakar, Inc.
Industry
Eligibility
18 Years to 65 Years
Enrollment
87 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020
U.S. locations
2
States / cities
Pasadena, California • Bellaire, Texas
Source: ClinicalTrials.gov public record
Updated Nov 22, 2021 · Synced Jul 22, 2026, 3:32 AM EDT
Terminated Phase 4 Interventional Results available

Clinical, Pharmacological and Molecular Effects of IV and Oral Acetaminophen in Adults With aSAH

NCT02549716
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 Jul 22, 2026, 3:32 AM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

Comparative Bioavailability Study of Codeine Sulfate

NCT01010152
View directory record Official record
Conditions
Pain
Interventions
Codeine Sulfate
Drug
Lead sponsor
Roxane Laboratories
Industry
Eligibility
18 Years to 45 Years
Enrollment
34 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2008
U.S. locations
1
States / cities
San Antonio, Texas
Source: ClinicalTrials.gov public record
Updated Jan 22, 2018 · Synced Jul 22, 2026, 3:32 AM EDT
Terminated Not applicable Interventional Results available

IV Acetaminophen vs IV Morphine for Pain Control in Pregnant Women

NCT02267772
View directory record Official record
Conditions
Pain Management in Pregnant Women
Interventions
IV Acetaminophen, IV Morphine
Drug
Lead sponsor
The University of Texas Health Science Center, Houston
Other
Eligibility
18 Years to 60 Years · Female only
Enrollment
163 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2014 – 2019
U.S. locations
2
States / cities
Houston, Texas
Source: ClinicalTrials.gov public record
Updated Jan 21, 2021 · Synced Jul 22, 2026, 3:32 AM EDT
Completed Phase 4 Interventional Results available

Time of Intravenous Acetaminophen Administration

NCT01699815
View directory record Official record
Conditions
Osteoarthritis
Interventions
Acetaminophen
Drug
Lead sponsor
Duke University
Other
Eligibility
30 Years to 75 Years
Enrollment
126 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2012 – 2013
U.S. locations
1
States / cities
Durham, North Carolina
Source: ClinicalTrials.gov public record
Updated Sep 4, 2014 · Synced Jul 22, 2026, 3:32 AM EDT
Withdrawn Phase 3 Interventional

Acetaminophen Randomized Controlled Trial

NCT02737124
View directory record Official record
Conditions
Post Operative Pain
Interventions
Acetaminophen, Placebo
Drug · Other
Lead sponsor
NYU Langone Health
Other
Eligibility
18 Years to 65 Years
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017 – 2018
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Jul 25, 2018 · Synced Jul 22, 2026, 3:32 AM EDT
Recruiting Phase 4 Interventional

Meloxicam in Mohs Micrographic Surgery

NCT07200544
View directory record Official record
Conditions
Postoperative Pain, Acute, Skin Cancer
Interventions
Meloxicam 7.5 mg, Meloxicam 15 mg, Acetaminophen 500mg
Drug
Lead sponsor
University of Oklahoma
Other
Eligibility
18 Years to 110 Years
Enrollment
300 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2025 – 2026
U.S. locations
1
States / cities
Oklahoma City, Oklahoma
Source: ClinicalTrials.gov public record
Updated Dec 14, 2025 · Synced Jul 22, 2026, 3:32 AM EDT
Completed Phase 3 Interventional

Evaluate the Time of Pain Relief of Fast Acting Aspirin Versus Acetaminophen in Subjects Diagnosed With Sore Throat Pain

NCT01453400
View directory record Official record
Conditions
Pharyngitis
Interventions
Acetylsalicylic Acid (Aspirin, BAY1019036) + placebo, Acetaminophen + placebo, Placebo
Drug
Lead sponsor
Bayer
Industry
Eligibility
18 Years and older
Enrollment
177 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2011 – 2012
U.S. locations
1
States / cities
Storrs, Connecticut
Source: ClinicalTrials.gov public record
Updated Dec 6, 2018 · Synced Jul 22, 2026, 3:32 AM EDT
Completed Phase 4 Interventional Accepts healthy volunteers

Hepatic Function in Alcoholics Following 5 Days of Acetaminophen Dosing

NCT00427206
View directory record Official record
Conditions
Alcohol Related Disorders
Interventions
acetaminophen (4g/day), placebo
Drug
Lead sponsor
Denver Health and Hospital Authority
Other
Eligibility
18 Years and older
Enrollment
181 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2004 – 2005
U.S. locations
1
States / cities
Denver, Colorado
Source: ClinicalTrials.gov public record
Updated Feb 8, 2009 · Synced Jul 22, 2026, 3:32 AM EDT
Completed No phase listed Observational Accepts healthy volunteers

Post Operative Analgesia and Patient Satisfaction

NCT04976387
View directory record Official record
Conditions
Postoperative Pain, Patient Satisfaction, Analgesia
Interventions
Not listed
Lead sponsor
Loma Linda University
Other
Eligibility
18 Years to 89 Years
Enrollment
160 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2023
U.S. locations
1
States / cities
Loma Linda, California
Source: ClinicalTrials.gov public record
Updated Mar 29, 2026 · Synced Jul 22, 2026, 3:32 AM EDT
Completed Phase 3 Interventional Results available

N-acetylcysteine in Non-Acetaminophen Pediatric Acute Liver Failure

NCT00248625
View directory record Official record
Conditions
Acute Liver Failure, Hepatic Encephalopathy
Interventions
N-acetylcysteine, Placebo
Drug
Lead sponsor
University of Pittsburgh
Other
Eligibility
Up to 18 Years
Enrollment
184 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2000 – 2010
U.S. locations
17
States / cities
San Francisco, California • Denver, Colorado • Atlanta, Georgia + 13 more
Source: ClinicalTrials.gov public record
Updated Jul 27, 2016 · Synced Jul 22, 2026, 3:32 AM EDT
Completed Phase 2 Interventional

Acetaminophen and Social Processes

NCT02108990
View directory record Official record
Conditions
Borderline Personality Disorder
Interventions
Acetaminophen
Drug
Lead sponsor
Ohio State University
Other
Eligibility
18 Years to 50 Years · Female only
Enrollment
9 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2013 – 2014
U.S. locations
1
States / cities
Columbus, Ohio
Source: ClinicalTrials.gov public record
Updated Jun 3, 2024 · Synced Jul 22, 2026, 3:32 AM EDT