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ClinicalTrials.gov public records Last synced Oct 4, 2026, 5:28 PM EDT

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Showing 1–24 of 138 matching trials from the live ClinicalTrials.gov search.
Filters: Intervention: Drug: Acetaminophen, Drug: Placebo Clear all
Terminated Not applicable Interventional Accepts healthy volunteers Results available

Does Preventive Analgesia Improve the Outcome of Demerol-Vistaril Procedural Sedations in Pediatric Dentistry

NCT01971853
View directory record Official record
Conditions
Pain
Interventions
oral placebo, Oral Analgesics
Drug
Lead sponsor
University of Colorado, Denver
Other
Eligibility
2 Years to 8 Years
Enrollment
88 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2013 – 2016
U.S. locations
1
States / cities
Aurora, Colorado
Source: ClinicalTrials.gov public record
Updated Jan 22, 2021 · Synced Oct 4, 2026, 5:28 PM EDT
Completed Phase 4 Interventional Accepts healthy volunteers Results available

IV Acetaminophen for Postoperative Pain Analgesia After Laparoscopic Hysterectomy

NCT02400580
View directory record Official record
Conditions
Pain
Interventions
IV acetaminophen, placebo
Drug
Lead sponsor
University of Pittsburgh
Other
Eligibility
18 Years to 75 Years · Female only
Enrollment
183 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2015 – 2016
U.S. locations
1
States / cities
Pittsburgh, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Jun 13, 2018 · Synced Oct 4, 2026, 5:28 PM EDT
Completed Phase 4 Interventional Results available

Acetaminophen (Tylenol) for Mood and Memory Changes Associated With Corticosteroid Therapy

NCT00377364
View directory record Official record
Conditions
Asthma, Rheumatic Disease
Interventions
Drug: Acetaminophen, Drug: Placebo
Drug
Lead sponsor
University of Texas Southwestern Medical Center
Other
Eligibility
18 Years to 65 Years
Enrollment
30 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2006 – 2008
U.S. locations
1
States / cities
Dallas, Texas
Source: ClinicalTrials.gov public record
Updated May 5, 2016 · Synced Oct 4, 2026, 5:28 PM 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 18, 2020 · Synced Oct 4, 2026, 5:28 PM EDT
Terminated Not applicable Interventional Results available

Intravenous Acetaminophen Use With Bariatric Surgery on Morbidly Obese Patients

NCT01527942
View directory record Official record
Conditions
Obesity, Pain
Interventions
Acetaminophen, Placebo
Drug
Lead sponsor
Trinity Health Of New England
Other
Eligibility
20 Years to 70 Years
Enrollment
34 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2012 – 2013
U.S. locations
1
States / cities
Hartford, Connecticut
Source: ClinicalTrials.gov public record
Updated Dec 17, 2015 · Synced Oct 4, 2026, 5:28 PM EDT
Withdrawn Phase 4 Interventional

Ketamine in Colorectal Surgery

NCT02785003
View directory record Official record
Conditions
Acute Pain, Pain, Postoperative, Colorectal Surgery
Interventions
Placebo, Ketamine, Acetaminophen, Opioid, Alvimopan
Drug
Lead sponsor
Medical College of Wisconsin
Other
Eligibility
18 Years and older
Healthy volunteers
Healthy volunteers not accepted
Timeline
2016 – 2018
U.S. locations
1
States / cities
Milwaukee, Wisconsin
Source: ClinicalTrials.gov public record
Updated Oct 26, 2017 · Synced Oct 4, 2026, 5:28 PM EDT
Recruiting Phase 3 Interventional

High-dose Prophylactic Gabapentin (HOPE) vs. Placebo to Prevent Opioid Use for Oral Mucositis Pain During Concurrent Chemoradiation for Head and Neck Cancer

NCT06992427
View directory record Official record
Conditions
Head and Neck Squamous Cell Carcinoma, Stage I Head and Neck Cutaneous Squamous Cell Carcinoma AJCC v8, Stage II Head and Neck Cutaneous Squamous Cell Carcinoma AJCC v8, Stage III Head and Neck Cutaneous Squamous Cell Carcinoma AJCC v8, Stage IV Head and Neck Cutaneous Squamous Cell Carcinoma AJCC v8
Interventions
Gabapentin, Placebo, Chemotheraphy, Radiation Therapy, Analgesic Agent, Biospecimen Collection, Survey Administration
Drug · Radiation · Procedure + 1 more
Lead sponsor
Alliance for Clinical Trials in Oncology
Other
Eligibility
18 Years and older
Enrollment
228 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2025 – 2031
U.S. locations
212
States / cities
Gilbert, Arizona • Peoria, Arizona • Phoenix, Arizona + 171 more
Source: ClinicalTrials.gov public record
Updated Oct 2, 2026 · Synced Oct 4, 2026, 5:28 PM EDT
Recruiting Phase 4 Interventional Accepts healthy volunteers

Preemptive Ibuprofen Effects on Pain Perception Following Extraction and Bone Graft

NCT05919745
View directory record Official record
Conditions
Pain, Post Operative, Quality of Life
Interventions
Ibuprofen 600 mg, Placebo, Acetaminophen
Drug
Lead sponsor
Marquette University
Other
Eligibility
18 Years and older
Enrollment
50 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2023 – 2026
U.S. locations
1
States / cities
Milwaukee, Wisconsin
Source: ClinicalTrials.gov public record
Updated Sep 27, 2024 · Synced Oct 4, 2026, 5:28 PM EDT
Completed Phase 3 Interventional

Herniorrhaphy for Postoperative Pain

NCT05813847
View directory record Official record
Conditions
Hernia, Inguinal, Post Operative Pain
Interventions
local anaesthetic injection of CPL-01, Morphine (rescue medication), Acetaminophen (rescue medication), Oxycodone (rescue medication), local anaesthetic injection of placebo, local anaesthetic injection of ropivacaine HCl, Open inguinal hernia repair
Drug · Procedure
Lead sponsor
Cali Pharmaceuticals LLC
Industry
Eligibility
18 Years to 75 Years
Enrollment
518 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2023 – 2025
U.S. locations
1
States / cities
Salt Lake City, Utah
Source: ClinicalTrials.gov public record
Updated Apr 30, 2026 · Synced Oct 4, 2026, 5:28 PM EDT
Completed No phase listed Observational Accepts healthy volunteers

Pain and Acetaminophen in Women Study

NCT04573426
View directory record Official record
Conditions
Overweight, Obesity, Healthy Adults
Interventions
Acetaminophen, Placebo, Weight stigma vignette, Control vignette
Drug · Behavioral
Lead sponsor
Ohio State University
Other
Eligibility
18 Years and older · Female only
Enrollment
200 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2019 – 2021
U.S. locations
1
States / cities
Columbus, Ohio
Source: ClinicalTrials.gov public record
Updated Sep 8, 2021 · Synced Oct 4, 2026, 5:28 PM EDT
Completed Phase 3 Interventional Results available

A Safety And Efficacy Study of Ibuprofen 250 mg / Acetaminophen 500 mg In The Treatment Of Post-Surgical Dental Pain

NCT02912650
View directory record Official record
Conditions
Post-surgical Pain Following Extraction of Molar Teeth
Interventions
Ibuprofen 250 mg / Acetaminophen 500 mg, Ibuprofen 250 mg, Acetaminophen 650 mg, Placebo
Drug
Lead sponsor
Pfizer
Industry
Eligibility
18 Years to 40 Years
Enrollment
568 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2015 – 2016
U.S. locations
1
States / cities
Salt Lake City, Utah
Source: ClinicalTrials.gov public record
Updated Aug 30, 2017 · Synced Oct 4, 2026, 5:28 PM EDT
Not listed Not applicable Interventional Accepts healthy volunteers

Modifying Virtual Reality Analgesia With Low-Dose Pain Medication

NCT01840774
View directory record Official record
Conditions
Virtual Reality Therapy
Interventions
Low-dose pain medication (Ketalar) and saline placebo
Drug
Lead sponsor
University of Washington
Other
Eligibility
18 Years to 60 Years
Enrollment
60 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2013 – 2014
U.S. locations
1
States / cities
Seattle, Washington
Source: ClinicalTrials.gov public record
Updated Apr 26, 2013 · Synced Oct 4, 2026, 5:28 PM 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 10, 2019 · Synced Oct 4, 2026, 5:28 PM EDT
Completed Phase 3 Interventional Results available

Efficacy and Safety of Intravenous Acetaminophen Over 48 Hrs for the Treatment of Post-op Pain After Gynecologic Surgery

NCT00399568
View directory record Official record
Conditions
Postoperative Pain, Hysterectomy
Interventions
IV Acetaminophen, IV Placebo 100 mL solution
Drug
Lead sponsor
Mallinckrodt
Industry
Eligibility
18 Years to 75 Years · Female only
Enrollment
331 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2006 – 2007
U.S. locations
27
States / cities
Birmingham, Alabama • Sheffield, Alabama • Phoenix, Arizona + 21 more
Source: ClinicalTrials.gov public record
Updated Oct 21, 2016 · Synced Oct 4, 2026, 5:28 PM EDT
Terminated Phase 2 Interventional Results available

Benzodiazepines for the Reduction of Distress and Pain During and After Emergency Department Care

NCT03756038
View directory record Official record
Conditions
Acute Pain
Interventions
Placebos, Lorazepam
Drug
Lead sponsor
Maria Pacella
Other
Eligibility
18 Years to 65 Years
Enrollment
1 participant
Healthy volunteers
Healthy volunteers not accepted
Timeline
2019
U.S. locations
2
States / cities
Pittsburgh, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Mar 9, 2020 · Synced Oct 4, 2026, 5:28 PM EDT
Completed Phase 3 Interventional

A Two-Arm Study Comparing the Analgesic Efficacy and Safety of Acetaminophen and Tramadol Combination BID Versus Placebo for the Treatment of Acute Low Back Pain

NCT00643383
View directory record Official record
Conditions
Acute Low Back Pain
Interventions
Combination drug (Acetaminophen + Tramadol), Placebo
Drug
Lead sponsor
Labopharm Inc.
Industry
Eligibility
18 Years to 80 Years
Enrollment
277 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2008 – 2009
U.S. locations
18
States / cities
Montgomery, Alabama • Centennial, Colorado • Hialeah, Florida + 14 more
Source: ClinicalTrials.gov public record
Updated May 1, 2012 · Synced Oct 4, 2026, 5:28 PM EDT
Completed Phase 3 Interventional Results available

TREXIMET® Versus Butalbital-containing Combination Medications for the Acute Treatment of Migraine in Adults

NCT00573170
View directory record Official record
Conditions
Migraine Disorders, Migraine, Acute
Interventions
TREXIMET®, Butalbital-containing Combination Medications (BCM), placebo
Drug
Lead sponsor
GlaxoSmithKline
Industry
Eligibility
18 Years to 65 Years
Enrollment
375 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2008 – 2009
U.S. locations
107
States / cities
Chandler, Arizona • Gilbert, Arizona • Litchfield Park, Arizona + 94 more
Source: ClinicalTrials.gov public record
Updated Dec 29, 2010 · Synced Oct 4, 2026, 5:28 PM 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 23, 2021 · Synced Oct 4, 2026, 5:28 PM EDT
Completed Phase 3 Interventional Accepts healthy volunteers Results available

Dextromethorphan as a Novel Non-opioid Adjunctive Agent for Pain Control in Medication Abortion

NCT03480009
View directory record Official record
Conditions
Abortion in First Trimester
Interventions
Dextromethorphan Hydrobromide, Avicel PH101 (Microcrystalline Cellulose NF) for Compounding, Oxycodone
Drug
Lead sponsor
Study Investigator-Sponsor
Other
Eligibility
18 Years and older · Female only
Enrollment
156 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2018 – 2019
U.S. locations
2
States / cities
Pittsburgh, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Aug 6, 2020 · Synced Oct 4, 2026, 5:28 PM EDT
Completed Phase 4 Interventional Results available

Effect of Perioperative Gabapentin on Postoperative Opioid Requirements

NCT05494385
View directory record Official record
Conditions
Postoperative Pain
Interventions
Preoperative Gabapentin/Postoperative Placebo, Preoperative Gabapentin/Postoperative Gabapentin
Drug
Lead sponsor
Indiana University
Other
Eligibility
18 Years and older · Female only
Enrollment
114 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2023
U.S. locations
1
States / cities
Indianapolis, Indiana
Source: ClinicalTrials.gov public record
Updated Oct 23, 2024 · Synced Oct 4, 2026, 5:28 PM EDT
Terminated Phase 2 Interventional

Evaluation of the Efficacy of Fomepizole in the Treatment of Acetaminophen Overdose

NCT05517668
View directory record Official record
Conditions
Acetaminophen, Drug Overdose, Acetaminophen Overdose, Acetaminophen Poisoning, Drug-induced Liver Injury, Liver Failure, Liver Toxicity
Interventions
Intravenous infusion of N-acetylcysteine, Intravenous infusion of Fomepizole (4-MP)
Drug
Lead sponsor
Richard Dart, MD, PhD
Other
Eligibility
10 Years to 99 Years
Enrollment
29 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2022 – 2025
U.S. locations
1
States / cities
Denver, Colorado
Source: ClinicalTrials.gov public record
Updated Nov 25, 2025 · Synced Oct 4, 2026, 5:28 PM EDT
Completed Phase 4 Interventional Results available

Efficacy and Safety of Acetaminophen, Aspirin and Caffeine With Sumatriptan in the Acute Treatment of Migraine

NCT01248468
View directory record Official record
Conditions
Pain, Migraine
Interventions
Aspirin, acetaminophen and caffeine, Sumatriptan, Placebo
Drug
Lead sponsor
Novartis
Industry
Eligibility
18 Years and older
Enrollment
752 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2010 – 2011
U.S. locations
20
States / cities
Anaheim, California • San Francisco, California • Clearwater, Florida + 17 more
Source: ClinicalTrials.gov public record
Updated Jul 30, 2012 · Synced Oct 4, 2026, 5:28 PM EDT
Completed Phase 4 Interventional Results available

IV Acetaminophen for Postoperative Pain After Pelvic Organ Prolapse Repair

NCT02155738
View directory record Official record
Conditions
Pelvic Organ Prolapse
Interventions
IV Acetaminophen, IV normal saline
Drug
Lead sponsor
Halina M Zyczynski, MD
Other
Eligibility
18 Years and older · Female only
Enrollment
204 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2014 – 2017
U.S. locations
1
States / cities
Pittsburgh, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Nov 19, 2018 · Synced Oct 4, 2026, 5:28 PM 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 22, 2026 · Synced Oct 4, 2026, 5:28 PM EDT