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Showing 1–24 of 293 matching trials from the live ClinicalTrials.gov search.
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Filters: Intervention: Placebo Acetaminophen Clear all
Completed Phase 3 Interventional Results available

A Study of Ibuprofen (IBU) 250mg/APAP 500mg In The Treatment Of Post-Surgical Dental Pain

NCT02837952
View directory record Official record
Conditions
Pain
Interventions
FDC IBU/APAP 250 mg/500 mg, Placebo
Drug
Lead sponsor
Pfizer
Industry
Eligibility
18 Years to 40 Years
Enrollment
123 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2016 – 2017
U.S. locations
1
States / cities
Salt Lake City, Utah
Source: ClinicalTrials.gov public record
Updated Mar 4, 2018 · Synced Sep 12, 2026, 10:03 PM EDT
Completed Phase 2 Interventional Results available

Study of Allogeneic Umbilical Cord Blood Infusion for Adults With Ischemic Stroke

NCT03004976
View directory record Official record
Conditions
Stroke, Stroke, Acute, Brain Injury, Acute
Interventions
Umbilical Cord Blood, Placebo
Biological · Other
Lead sponsor
Joanne Kurtzberg, MD
Other
Eligibility
18 Years to 90 Years
Enrollment
79 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017 – 2021
U.S. locations
6
States / cities
Aurora, Colorado • Gainesville, Florida • Atlanta, Georgia + 3 more
Source: ClinicalTrials.gov public record
Updated Dec 5, 2022 · Synced Sep 12, 2026, 10:03 PM EDT
Withdrawn Phase 4 Interventional

A Pilot Study Investigating the Efficacy of Minocycline and N-Acetyl Cysteine for Bipolar Depression

NCT02719392
View directory record Official record
Conditions
Bipolar Disorder, Bipolar Depression
Interventions
N-acetylcysteine, Minocycline, Placebo
Dietary Supplement · Drug · Other
Lead sponsor
Massachusetts General Hospital
Other
Eligibility
18 Years to 65 Years
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017 – 2026
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Jul 23, 2026 · Synced Sep 12, 2026, 10:03 PM EDT
Completed Phase 4 Interventional Results available

Efficacy of IV Acetaminophen Versus Oral Acetaminophen

NCT03365622
View directory record Official record
Conditions
Nephrectomy
Interventions
Acetaminophen, Placebos, Placebo Oral Tablet
Drug
Lead sponsor
University of Rochester
Other
Eligibility
18 Years to 89 Years
Enrollment
214 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018 – 2024
U.S. locations
1
States / cities
Rochester, New York
Source: ClinicalTrials.gov public record
Updated Jun 28, 2025 · Synced Sep 12, 2026, 10:03 PM EDT
Completed Phase 3 Interventional

Phase III Study of the Safety and Efficacy of Cl-108 in the Treatment of Moderate to Severe Pain

NCT01780428
View directory record Official record
Conditions
Pain, Nausea, Vomiting
Interventions
CL-108 (hydrodocone 7.5 mg, acetaminophen 325 mg, promethazine 12.5 mg), Placebo
Drug
Lead sponsor
Charleston Laboratories, Inc
Industry
Eligibility
18 Years and older
Enrollment
460 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2013 – 2014
U.S. locations
1
States / cities
Philadelphia, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Nov 2, 2016 · Synced Sep 12, 2026, 10:03 PM EDT
Completed Phase 2 Interventional Results available

A Study Evaluating Efficacy and Safety of VX-548 for Acute Pain After a Bunionectomy

NCT04977336
View directory record Official record
Conditions
Acute Pain
Interventions
VX-548, HB/APAP, Placebo (matched to VX-548), Placebo (matched to HB/APAP)
Drug
Lead sponsor
Vertex Pharmaceuticals Incorporated
Industry
Eligibility
18 Years to 75 Years
Enrollment
274 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2022
U.S. locations
12
States / cities
Sheffield, Alabama • Phoenix, Arizona • Anaheim, California + 9 more
Source: ClinicalTrials.gov public record
Updated Jun 24, 2025 · Synced Sep 12, 2026, 10:03 PM EDT
Completed Not applicable Interventional

TENS Unit To Decrease Pain After Laminaria Insertion

NCT06529003
View directory record Official record
Conditions
Second Trimester Abortion
Interventions
Transcutaneous Electrical Nerve Stimulation (TENS) unit, Placebo
Device
Lead sponsor
Queen's Medical Center
Other
Eligibility
18 Years and older · Female only
Enrollment
36 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2024 – 2025
U.S. locations
1
States / cities
Honolulu, Hawaii
Source: ClinicalTrials.gov public record
Updated Dec 15, 2025 · Synced Sep 12, 2026, 10:03 PM EDT
Not listed Not applicable Interventional

Prospective, Randomized, Double Blind Study Comparing IV vs PO Acetaminophen in Patients Undergoing Lumbar Discectomy

NCT02067442
View directory record Official record
Conditions
Pain
Interventions
oral acetaminophen, intravenous acetaminophen
Drug
Lead sponsor
Thomas Jefferson University
Other
Eligibility
18 Years to 65 Years
Enrollment
100 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
Started 2013
U.S. locations
1
States / cities
Philadelphia, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Mar 17, 2015 · Synced Sep 12, 2026, 10:03 PM EDT
Completed Phase 4 Interventional Results available

Are Opioids Needed After ACL Reconstruction

NCT04285853
View directory record Official record
Conditions
Anterior Cruciate Ligament Rupture
Interventions
Oxycodone, Placebo oral tablet
Drug
Lead sponsor
Emory University
Other
Eligibility
14 Years to 40 Years
Enrollment
98 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2022
U.S. locations
3
States / cities
Atlanta, Georgia • Tucker, Georgia
Source: ClinicalTrials.gov public record
Updated Oct 10, 2023 · Synced Sep 12, 2026, 10:03 PM EDT
Terminated Phase 3 Interventional Accepts healthy volunteers Results available

Clinical Study to Evaluate Efficacy of New Paracetamol Formulation Compared to Ibuprofen in Headache

NCT01842633
View directory record Official record
Conditions
Pain
Interventions
Paracetamol and Caffeine, Ibuprofen, Placebo
Drug · Other
Lead sponsor
GlaxoSmithKline
Industry
Eligibility
18 Years to 65 Years
Enrollment
365 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2013 – 2015
U.S. locations
1
States / cities
Waltham, Massachusetts
Source: ClinicalTrials.gov public record
Updated Aug 31, 2017 · Synced Sep 12, 2026, 10:03 PM EDT
Withdrawn Phase 2Phase 3 Interventional Accepts healthy volunteers

Preemptive Acetaminophen for Postoperative Pain Control Following Minimally Invasive Hysterectomy

NCT04360135
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 Sep 12, 2026, 10:03 PM EDT
Completed Phase 4 Interventional Results available

Preoperative IV Versus Oral Acetaminophen

NCT03468920
View directory record Official record
Conditions
Pain, Postoperative
Interventions
IV Acetaminophen, PO Acetaminophen, PO Placebo, IV Solution Placebo
Drug
Lead sponsor
TriHealth Inc.
Other
Eligibility
18 Years and older
Enrollment
120 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018 – 2019
U.S. locations
1
States / cities
Cincinnati, Ohio
Source: ClinicalTrials.gov public record
Updated May 13, 2019 · Synced Sep 12, 2026, 10:03 PM EDT
Completed Phase 4 Interventional Results available

Post-operative Dental Pain Study Comparing Two Different Dosage of Analgesic Efficacy

NCT01075243
View directory record Official record
Conditions
Post-surgical Dental Pain
Interventions
Paracetamol 1000 mg, Paracetamol 650 mg, Placebo
Drug
Lead sponsor
GlaxoSmithKline
Industry
Eligibility
18 Years to 45 Years
Enrollment
401 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009 – 2010
U.S. locations
1
States / cities
Salt Lake City, Utah
Source: ClinicalTrials.gov public record
Updated Apr 28, 2015 · Synced Sep 12, 2026, 10:03 PM EDT
Completed Phase 4 Interventional Accepts healthy volunteers

Clinical Immunization Safety Assessment (CISA) Project: Pilot Study to Assess the Effect of Prophylactic Antipyretics on Immune Responses and Fever After IIV

NCT01946594
View directory record Official record
Conditions
Fever
Interventions
Acetaminophen, Placebo
Other
Lead sponsor
Duke University
Other
Eligibility
12 Months to 35 Months
Enrollment
41 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2013 – 2014
U.S. locations
1
States / cities
Durham, North Carolina
Source: ClinicalTrials.gov public record
Updated Jan 19, 2016 · Synced Sep 12, 2026, 10:03 PM EDT
Completed Not applicable Interventional Results available

Pain and Anxiety Management With Oral Narcotic for Pediatric Suture Repair

NCT01053637
View directory record Official record
Conditions
Children, Lacerations, Procedures, Child, Pain
Interventions
hydrocodone/acetaminophen, Sugar water
Drug
Lead sponsor
Baylor College of Medicine
Other
Eligibility
2 Years to 17 Years
Enrollment
85 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009 – 2015
U.S. locations
1
States / cities
Houston, Texas
Source: ClinicalTrials.gov public record
Updated Aug 24, 2021 · Synced Sep 12, 2026, 10:03 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 7, 2021 · Synced Sep 12, 2026, 10:03 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 8, 2020 · Synced Sep 12, 2026, 10:03 PM EDT
Terminated Phase 4 Interventional Accepts healthy volunteers Results available

Trial Comparing Intravenous and Oral Moderate Sedation for First Trimester Surgical Abortions

NCT01011634
View directory record Official record
Conditions
Undesired Intrauterine Pregnancy, First Trimester Pregnancy
Interventions
Intravenous moderate sedation versus oral medication
Drug
Lead sponsor
University of California, San Francisco
Other
Eligibility
16 Years to 55 Years · Female only
Enrollment
18 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2007 – 2008
U.S. locations
1
States / cities
San Francisco, California
Source: ClinicalTrials.gov public record
Updated May 15, 2013 · Synced Sep 12, 2026, 10:03 PM EDT
Completed Phase 3 Interventional Results available

Safety and Efficacy of COV795 in Moderate to Severe Post-Operative Bunionectomy Pain With an Open-label Extension

NCT01484652
View directory record Official record
Conditions
Pain, Postoperative, Bunion
Interventions
COV795, Placebo
Drug
Lead sponsor
Mallinckrodt
Industry
Eligibility
18 Years to 75 Years
Enrollment
329 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2011 – 2012
U.S. locations
5
States / cities
Bakersfield, California • Pasadena, California • Pasadena, Maryland + 2 more
Source: ClinicalTrials.gov public record
Updated Oct 20, 2016 · Synced Sep 12, 2026, 10:03 PM EDT
Terminated Phase 2 Interventional Accepts healthy volunteers Results available

Subcutaneous Bupivacaine Decrease Post-op Pain in Patients Undergoing C-Section

NCT03383588
View directory record Official record
Conditions
Pain, Referred
Interventions
Bupivacaine, Morphine, Fentanyl, Epinephrine, Saline solution
Drug · Other
Lead sponsor
Montefiore Medical Center
Other
Eligibility
17 Years to 40 Years · Female only
Enrollment
26 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2018
U.S. locations
1
States / cities
The Bronx, New York
Source: ClinicalTrials.gov public record
Updated Jan 12, 2020 · Synced Sep 12, 2026, 10:03 PM EDT
Completed Phase 3 Interventional Results available

Safety and Efficacy Study of Fentanyl Buccal Tablet Use in the Emergency Department for Isolated Extremity Injury

NCT01270659
View directory record Official record
Conditions
Pain
Interventions
Fentanyl, oxycodone/acetaminophen
Drug
Lead sponsor
University of Oklahoma
Other
Eligibility
18 Years to 60 Years
Enrollment
60 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2011 – 2014
U.S. locations
1
States / cities
Tulsa, Oklahoma
Source: ClinicalTrials.gov public record
Updated Jun 19, 2017 · Synced Sep 12, 2026, 10:03 PM EDT
Completed Phase 2 Interventional Results available

Acetaminophen for the Reduction of Oxidative Injury in Severe Sepsis

NCT01739361
View directory record Official record
Conditions
Severe Sepsis
Interventions
Acetaminophen, placebo
Drug
Lead sponsor
Vanderbilt University
Other
Eligibility
18 Years and older
Enrollment
44 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2013
U.S. locations
1
States / cities
Nashville, Tennessee
Source: ClinicalTrials.gov public record
Updated Dec 25, 2017 · Synced Sep 12, 2026, 10:03 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 16, 2015 · Synced Sep 12, 2026, 10:03 PM EDT
Completed Phase 2 Interventional

Study of Acetaminophen (ACE) in Post-operative Dental Pain

NCT02320708
View directory record Official record
Conditions
Dental Pain
Interventions
Acetaminophen (ACE) (1000 mg), Commercial ACE (1000 mg), Commercial Ibuprofen (IBU) (400 mg), Placebo
Drug
Lead sponsor
Johnson & Johnson Healthcare Products Division of McNEIL-PPC, Inc.
Industry
Eligibility
17 Years to 50 Years
Enrollment
240 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2014 – 2015
U.S. locations
1
States / cities
Salt Lake City, Utah
Source: ClinicalTrials.gov public record
Updated Dec 2, 2021 · Synced Sep 12, 2026, 10:03 PM EDT