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Showing 25–48 of 24 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 Flurbiprofen 8.75 mg Lozenge in Patients With Pharyngitis

NCT01048866
View directory record Official record
Conditions
Pharyngitis
Interventions
placebo, flurbiprofen, acetaminophen 650mg
Drug
Lead sponsor
Reckitt Benckiser LLC
Industry
Eligibility
18 Years and older
Enrollment
198 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009 – 2011
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Sep 20, 2017 · Synced Sep 25, 2026, 7:37 PM EDT
Completed Phase 4 Interventional Results available

IV Acetaminophen as an Analgesic Adjunct

NCT02621619
View directory record Official record
Conditions
Acute Pain
Interventions
IV acetaminophen + 0.5 mg IV hydromorphone, Normal saline + 0.5 mg IV hydromorphone
Drug
Lead sponsor
Montefiore Medical Center
Other
Eligibility
65 Years and older
Enrollment
159 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2016 – 2017
U.S. locations
1
States / cities
The Bronx, New York
Source: ClinicalTrials.gov public record
Updated Nov 7, 2018 · Synced Sep 25, 2026, 7:37 PM EDT
Completed Phase 3 Interventional Accepts healthy volunteers Results available

A Study of Ibuprofen 250 mg / Acetaminophen 500 mg Comparing The Antipyretic Effects in Healthy Male Volunteers

NCT02761980
View directory record Official record
Conditions
Fever
Interventions
Ibuprofen 250 mg / Acetaminophen 500 mg, Ibuprofen 250 mg, Acetaminophen 500 mg, Placebo
Drug
Lead sponsor
Pfizer
Industry
Eligibility
18 Years to 55 Years · Male only
Enrollment
290 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2016 – 2017
U.S. locations
1
States / cities
Knoxville, Tennessee
Source: ClinicalTrials.gov public record
Updated Dec 6, 2018 · Synced Sep 25, 2026, 7:37 PM EDT
Terminated Phase 4 Interventional

Effect of Perioperative Acetaminophen Dosing on Patients Undergoing Surgical Treatment of Basilar Thumb Arthritis

NCT05556356
View directory record Official record
Conditions
Carpometacarpal Osteoarthritis
Interventions
Acetaminophen, Placebo: Multivitamin
Drug · Other
Lead sponsor
Indiana Hand to Shoulder Center
Other
Eligibility
18 Years and older
Enrollment
23 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2022 – 2024
U.S. locations
1
States / cities
Indianapolis, Indiana
Source: ClinicalTrials.gov public record
Updated Oct 7, 2024 · Synced Sep 25, 2026, 7:37 PM EDT
Terminated Phase 4 Interventional Results available

Treating Urological Chronic Pelvic Pain Syndrome (UCPPS) Pain

NCT02385266
View directory record Official record
Conditions
Chronic Prostatitis With Chronic Pelvic Pain Syndrome
Interventions
D-Cycloserine, Placebo (for D-cycloserine)
Drug
Lead sponsor
Northwestern University
Other
Eligibility
18 Years and older · Male only
Enrollment
24 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2013 – 2016
U.S. locations
1
States / cities
Chicago, Illinois
Source: ClinicalTrials.gov public record
Updated May 16, 2023 · Synced Sep 25, 2026, 7:37 PM EDT
Terminated Phase 4 Interventional

Biofreeze® vs. a Placebo on Knee Osteoarthritis Walking Gait Characteristics and Pain

NCT03888807
View directory record Official record
Conditions
Knee Osteoarthritis
Interventions
Biofreeze, Placebo
Drug
Lead sponsor
Sport and Spine Rehab Clinical Research Foundation
Other
Eligibility
40 Years and older
Enrollment
6 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018 – 2024
U.S. locations
1
States / cities
Rockville, Maryland
Source: ClinicalTrials.gov public record
Updated Aug 1, 2024 · Synced Sep 25, 2026, 7:37 PM EDT
Not listed Not applicable Interventional

Efficacy of IV Acetaminophen in Acute Post-Operative Pain Control in Laparoscopic Roux-en-Y Gastric Bypass Surgery (LRYGBP) Patients

NCT01460667
View directory record Official record
Conditions
Morbid Obesity
Interventions
IV acetaminophen, IV normal saline
Drug
Lead sponsor
McLaren Regional Medical Center
Other
Eligibility
18 Years to 65 Years
Enrollment
85 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
Started 2011
U.S. locations
1
States / cities
Flint, Michigan
Source: ClinicalTrials.gov public record
Updated Oct 26, 2011 · Synced Sep 25, 2026, 7:37 PM EDT
Recruiting Not applicable Interventional

Open-label Placebo (COLP) for Pain in Adolescent Idiopathic Scoliosis (AIS) Surgery+Surgical Treatment of Idiopathic Scoliosis

NCT06365892
View directory record Official record
Conditions
Adolescent Idiopathic Scoliosis (AIS)
Interventions
open-label placebo, Treatment as usual
Other
Lead sponsor
University of California, San Francisco
Other
Eligibility
10 Years to 18 Years
Enrollment
64 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2024 – 2026
U.S. locations
1
States / cities
San Francisco, California
Source: ClinicalTrials.gov public record
Updated Mar 12, 2026 · Synced Sep 25, 2026, 7:37 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 4, 2016 · Synced Sep 25, 2026, 7:37 PM EDT
Completed Phase 4 Interventional Results available

Preoperative Gabapentin vs Placebo for Vaginal Prolapse Surgery

NCT05658887
View directory record Official record
Conditions
Pelvic Organ Prolapse, Perioperative/Postoperative Complications
Interventions
Gabapentin, Gabapentin Placebo
Drug
Lead sponsor
Joseph Kowalski
Other
Eligibility
18 Years and older · Female only
Enrollment
110 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2023 – 2024
U.S. locations
1
States / cities
Iowa City, Iowa
Source: ClinicalTrials.gov public record
Updated Aug 11, 2025 · Synced Sep 25, 2026, 7:37 PM EDT
Completed Phase 2 Interventional Results available

Acetaminophen/Naproxen Sodium Dose Ranging Study

NCT04447040
View directory record Official record
Conditions
Pain
Interventions
Acetaminophen/naproxen sodium Dose A, Acetaminophen/naproxen sodium Dose B, Acetaminophen/naproxen sodium Dose C, Acetaminophen/naproxen sodium Dose D, Acetaminophen/naproxen sodium Dose E, Placebo
Drug
Lead sponsor
Johnson & Johnson Consumer Inc., McNeil Consumer Healthcare Division
Industry
Eligibility
17 Years to 50 Years
Enrollment
304 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2021
U.S. locations
1
States / cities
Salt Lake City, Utah
Source: ClinicalTrials.gov public record
Updated Mar 23, 2025 · Synced Sep 25, 2026, 7:37 PM EDT
Completed Not applicable Interventional Results available

Post-op Acetaminophen vs NSAID Use on Lumbar Spinal Fusion Outcomes

NCT02700451
View directory record Official record
Conditions
Lumbar Osteoarthritis, Spondylosis, Lumbar Disc Disease, Spinal Stenosis
Interventions
Ketorolac, Acetaminophen, Placebo
Drug
Lead sponsor
Hospital for Special Surgery, New York
Other
Eligibility
18 Years to 75 Years
Enrollment
178 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2016 – 2023
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Jul 9, 2023 · Synced Sep 25, 2026, 7:37 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 25, 2026, 7:37 PM 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 Sep 25, 2026, 7:37 PM EDT
Completed Phase 4 Interventional Accepts healthy volunteers Results available

A Randomized Controlled Trial of Oral Acetaminophen for Analgesic Control After Transvaginal Oocyte Retrieval

NCT02418182
View directory record Official record
Conditions
Pain
Interventions
Acetaminophen, placebo
Drug
Lead sponsor
University of Alabama at Birmingham
Other
Eligibility
21 Years to 45 Years · Female only
Enrollment
99 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2015 – 2016
U.S. locations
1
States / cities
Birmingham, Alabama
Source: ClinicalTrials.gov public record
Updated Feb 17, 2020 · Synced Sep 25, 2026, 7:37 PM EDT
Completed Not applicable Interventional Results available

Scrambler Therapy in the Treatment of Chronic Chemotherapy-Induced Peripheral Neuropathy

NCT02111174
View directory record Official record
Conditions
Neuropathy
Interventions
Scrambler Therapy, Sham Therapy
Device
Lead sponsor
Sidney Kimmel Comprehensive Cancer Center at Johns Hopkins
Other
Eligibility
18 Years and older
Enrollment
37 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2015 – 2017
U.S. locations
1
States / cities
Baltimore, Maryland
Source: ClinicalTrials.gov public record
Updated Aug 16, 2018 · Synced Sep 25, 2026, 7:37 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 25, 2026, 7:37 PM EDT
Completed Phase 2 Interventional Results available

Effects of Inhibiting Early Inflammation in Kidney Transplant Patients

NCT02495077
View directory record Official record
Conditions
Kidney Transplant
Interventions
Infliximab, Methylprednisolone, Mycophenolate Mofetil, Tacrolimus, Thymoglobulin®, Acetaminophen, Loratadine, Placebo for Infliximab, Prednisone, Diphenhydramine
Biological · Drug
Lead sponsor
National Institute of Allergy and Infectious Diseases (NIAID)
NIH
Eligibility
18 Years and older
Enrollment
290 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2015 – 2021
U.S. locations
13
States / cities
Birmingham, Alabama • Los Angeles, California • San Francisco, California + 8 more
Source: ClinicalTrials.gov public record
Updated Sep 23, 2026 · Synced Sep 25, 2026, 7:37 PM EDT
Withdrawn Phase 1Phase 2 Interventional Accepts healthy volunteers

Platelet-Rich Plasma and the Effects of NSAIDs on Pain and Functional Scores in Knee Osteoarthritis

NCT05742763
View directory record Official record
Conditions
Osteoarthritis of the Knee, Degenerative Osteoarthritis, Knee Pain Chronic
Interventions
Ibuprofen and PRP, Acetaminophen and PRP, Placebo and PRP
Combination Product
Lead sponsor
QC Kinetix LLC
Industry
Eligibility
50 Years and older
Healthy volunteers
Accepts healthy volunteers
Timeline
2023 – 2024
U.S. locations
1
States / cities
Charlotte, North Carolina
Source: ClinicalTrials.gov public record
Updated Oct 8, 2024 · Synced Sep 25, 2026, 7:37 PM EDT
Completed Phase 4 Interventional Results available

Study to Collect Information on How Well the Study Drug Naproxen Sodium Tablets Works Compared to Hydrocodone/Acetaminophen Tablets in Order to Relieve Pain in Participants Experiencing Moderate to Severe Pain After Having Their Wisdom Teeth Removed

NCT04307940
View directory record Official record
Conditions
Pain
Interventions
Naproxen Sodium (Aleve, BAY117031), Hydrocodone/Acetaminophen, Placebo
Drug
Lead sponsor
Bayer
Industry
Eligibility
18 Years to 40 Years
Enrollment
221 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020
U.S. locations
1
States / cities
Salt Lake City, Utah
Source: ClinicalTrials.gov public record
Updated Jul 13, 2022 · Synced Sep 25, 2026, 7:37 PM EDT
Not listed Phase 3 Interventional

Randomized Trial of Intraoperative IV Versus Preoperative Oral Acetaminophen During Ambulatory Lumbar Discectomy

NCT04574778
View directory record Official record
Conditions
Pain, Postoperative, Spine Surgery
Interventions
Acetaminophen
Drug
Lead sponsor
Rothman Institute Orthopaedics
Other
Eligibility
18 Years and older
Enrollment
82 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2024
U.S. locations
1
States / cities
Philadelphia, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Jan 11, 2024 · Synced Sep 25, 2026, 7:37 PM EDT
Withdrawn Not applicable Interventional

Acetaminophen in Combination With N-Acetylcysteine (NAC) Versus Placebo in Treating Fever

NCT01137591
View directory record Official record
Conditions
Liver Failure, Liver Failure, Acute, Drug Induced Liver Injury, Prevention & Control, Fever
Interventions
APAP and NAC combination, APAP and Placebo
Drug
Lead sponsor
Columbia University
Other
Eligibility
18 Years to 75 Years
Healthy volunteers
Healthy volunteers not accepted
Timeline
Started 2009
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Mar 4, 2015 · Synced Sep 25, 2026, 7:37 PM EDT
Not yet recruiting Phase 4 Interventional

Oral Versus Intravenous Acetaminophen in Lumbar Spine Surgery

NCT07203079
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 Sep 25, 2026, 7:37 PM EDT
Completed Phase 2 Interventional Results available

Acetaminophen and Ascorbate in Sepsis: Targeted Therapy to Enhance Recovery

NCT04291508
View directory record Official record
Conditions
Acute Respiratory Distress Syndrome, Critical Illness, Respiratory Failure, Sepsis
Interventions
Intravenous Acetaminophen (room temperature), Intravenous Vitamin C (refrigerated), 5% Dextrose (room temperature), 5% Dextrose refrigerated
Drug
Lead sponsor
Massachusetts General Hospital
Other
Eligibility
18 Years and older
Enrollment
488 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2023
U.S. locations
41
States / cities
Birmingham, Alabama • Tucson, Arizona • Fresno, California + 34 more
Source: ClinicalTrials.gov public record
Updated Sep 26, 2024 · Synced Sep 25, 2026, 7:37 PM EDT