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Showing 1–24 of 258 matching trials from the live ClinicalTrials.gov search.
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Filters: Intervention: Acetaminophen Alone Clear all
Completed Phase 4 Interventional Accepts healthy volunteers Results available

Reduction in Pain Intensity Following IV or Oral Pain-relieving Products

NCT02678416
View directory record Official record
Conditions
Pain
Interventions
IV Acetaminophen (Treatment A), Oral Acetaminophen (Treatment B), Placebo (Treatment C), Morphine (Treatment D)
Drug · Other
Lead sponsor
Mallinckrodt
Industry
Eligibility
18 Years to 55 Years · Male only
Enrollment
79 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2015 – 2016
U.S. locations
1
States / cities
Salt Lake City, Utah
Source: ClinicalTrials.gov public record
Updated Feb 4, 2020 · Synced Sep 6, 2026, 4:14 PM EDT
Completed Phase 4 Interventional Results available

Acetaminophen (APAP) +/- Oxycodone

NCT04122443
View directory record Official record
Conditions
Musculoskeletal Pain
Interventions
Acetaminophen, Oxycodone
Drug
Lead sponsor
Montefiore Medical Center
Other
Eligibility
18 Years and older
Enrollment
393 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2019 – 2022
U.S. locations
1
States / cities
The Bronx, New York
Source: ClinicalTrials.gov public record
Updated Feb 27, 2024 · Synced Sep 6, 2026, 4:14 PM EDT
Terminated Phase 3 Interventional Results available

A Study to Evaluate the Safety of Rituximab Retreatment in Subjects With Systemic Lupus Erythematosus

NCT00381810
View directory record Official record
Conditions
Lupus Erythematosus, Systemic
Interventions
Rituximab, Methylprednisolone, Acetaminophen, Diphenhydramine
Drug
Lead sponsor
Genentech, Inc.
Industry
Eligibility
16 Years to 75 Years
Enrollment
31 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2006 – 2012
U.S. locations
11
States / cities
Paradise Valley, Arizona • San Leandro, California • Boise, Idaho + 8 more
Source: ClinicalTrials.gov public record
Updated Jul 31, 2017 · Synced Sep 6, 2026, 4:14 PM EDT
Active, not recruiting Phase 4 Interventional Accepts healthy volunteers Results available

Opioid-Free Pain Protocol After Shoulder Arthroplasty

NCT05488847
View directory record Official record
Conditions
Shoulder Arthropathy, Shoulder Pain
Interventions
Celecoxib, Pregabalin, Tramadol, Dexamethasone, Acetaminophen, Ropivicaine, Epinephrine, Ketorolac, Tizanidine, Magnesium, Ibuprofen, Oxycodone Hydrochloride 5 Mg
Drug
Lead sponsor
Henry Ford Health System
Other
Eligibility
18 Years and older
Enrollment
83 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2022 – 2026
U.S. locations
1
States / cities
Detroit, Michigan
Source: ClinicalTrials.gov public record
Updated Feb 9, 2026 · Synced Sep 6, 2026, 4:14 PM EDT
Completed Phase 4 Interventional Results available

Multimodal Analgesia With Acetaminophen vs. Narcotics Alone After Hip Arthroscopy

NCT03510910
View directory record Official record
Conditions
Hip Arthroscopy
Interventions
Acetaminophen, Percocet
Drug
Lead sponsor
NYU Langone Health
Other
Eligibility
18 Years to 65 Years
Enrollment
100 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018 – 2019
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Jan 6, 2021 · Synced Sep 6, 2026, 4:14 PM EDT
Completed Early Phase 1 Interventional Accepts healthy volunteers Results available

Emergence Agitation and Pain Scores in Pediatrics When Comparing Single-modal vs Multi-modal Analgesia for ENT Surgery

NCT03062488
View directory record Official record
Conditions
Emergence Agitation, Pain
Interventions
IV acetaminophen, Fentanyl, PO acetaminophen
Drug
Lead sponsor
Nemours Children's Clinic
Other
Eligibility
24 Months to 7 Years
Enrollment
143 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2017 – 2018
U.S. locations
1
States / cities
Jacksonville, Florida
Source: ClinicalTrials.gov public record
Updated Jan 17, 2020 · Synced Sep 6, 2026, 4:14 PM EDT
Completed Phase 3 Interventional Accepts healthy volunteers Results available

A Study to Learn How Well a Single Dose of the Study Treatment Naproxen Sodium and Caffeine Combined in One Tablet (Fixed-dose Combination) Works to Relieve Pain After Dental Surgeries Compared to the Single Ingredients and to Placebo

NCT05485805
View directory record Official record
Conditions
Postoperative Dental Pain
Interventions
Naproxen sodium and caffeine (BAY2880376), Naproxen sodium (Aleve), Caffeine, Placebo
Drug
Lead sponsor
Bayer
Industry
Eligibility
16 Years and older
Enrollment
541 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2022 – 2024
U.S. locations
1
States / cities
Salt Lake City, Utah
Source: ClinicalTrials.gov public record
Updated Mar 24, 2025 · Synced Sep 6, 2026, 4:14 PM EDT
Withdrawn Phase 4 Interventional

Suboxone User Perioperative Early Referral and Enhanced Recovery After Surgery- Orthopaedic Trauma Surgery Population

NCT04464512
View directory record Official record
Conditions
Addiction Opiate, Chronic Pain, Fractures, Bone, Buprenorphine Dependence
Interventions
Sufentanil
Drug
Lead sponsor
West Virginia University
Other
Eligibility
18 Years to 65 Years
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2021
U.S. locations
1
States / cities
Morgantown, West Virginia
Source: ClinicalTrials.gov public record
Updated Dec 11, 2022 · Synced Sep 6, 2026, 4:14 PM EDT
Completed Not applicable Interventional

Postoperative Pain Management Following Robotic Assisted Sacrocolpopexy

NCT06309693
View directory record Official record
Conditions
Pelvic Organ Prolapse, Post Operative Pain
Interventions
Quadratus Lumborum (QL) Block, Enhanced Recovery After Surgical (ERAS) Protocol
Procedure
Lead sponsor
University of Alabama at Birmingham
Other
Eligibility
18 Years and older · Female only
Enrollment
70 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2025 – 2026
U.S. locations
1
States / cities
Birmingham, Alabama
Source: ClinicalTrials.gov public record
Updated Jan 11, 2026 · Synced Sep 6, 2026, 4:14 PM EDT
Completed Not applicable Interventional

Photobiomodulation to Demonstrate Safety and Reduce the Incidence of Oral Mucositis in Adult Head & Neck Cancer Patients

NCT03972527
View directory record Official record
Conditions
Oral Mucositis (Ulcerative), Oral Mucositis (Ulcerative) Due to Radiation, Oral Mucositis (Ulcerative) Due to Antineoplastic Therapy, Head and Neck Cancer
Interventions
Photobiomodulation, Routine Oral Care and Analgesia
Device · Other
Lead sponsor
MuReva Phototherapy Inc.
Industry
Eligibility
22 Years and older
Enrollment
85 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2022 – 2024
U.S. locations
12
States / cities
Birmingham, Alabama • Long Beach, California • Miami, Florida + 9 more
Source: ClinicalTrials.gov public record
Updated Aug 20, 2024 · Synced Sep 6, 2026, 4:14 PM EDT
Completed Phase 4 Interventional

Caldolor Versus Caldolor Plus OFIRMEV in Total Knee or Hip Arthroplasty Surgeries

NCT01773005
View directory record Official record
Conditions
Pain
Interventions
Ofirmev, Caldolor
Drug
Lead sponsor
Anita Gupta
Other
Eligibility
18 Years to 70 Years
Enrollment
78 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2012 – 2014
U.S. locations
1
States / cities
Philadelphia, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Feb 28, 2016 · Synced Sep 6, 2026, 4:14 PM EDT
Withdrawn Phase 1 Interventional Accepts healthy volunteers

Effects of Xenin-25 on Insulin Secretion and Gastric Emptying in Humans With and Without a Complete Truncal Vagotomy

NCT01951716
View directory record Official record
Conditions
Does the Vagus Nerve Mediate the Effects of Xenin-25
Interventions
Graded Glucose Infusion with Placebo, Graded Glucose Infusion with GIP Alone, Graded Glucose Infusion with xenin-25 alone, Graded Glucose Infusion with GIP plus xenin-25, Meal Tolerance Test with Placebo, Meal Tolerance Test with xenin-25
Drug
Lead sponsor
Washington University School of Medicine
Other
Eligibility
18 Years to 70 Years
Healthy volunteers
Accepts healthy volunteers
Timeline
2013 – 2018
U.S. locations
1
States / cities
St Louis, Missouri
Source: ClinicalTrials.gov public record
Updated Apr 25, 2018 · Synced Sep 6, 2026, 4:14 PM EDT
Completed Phase 3 Interventional Accepts healthy volunteers

Evaluate Onset of Action of a Fast Release Aspirin

NCT01420094
View directory record Official record
Conditions
Healthy Subjects
Interventions
Acetylsalicyclic acid (Fast release Aspirin, BAY1019036), Acetaminophen (Tylenol extra strength), Placebo
Drug
Lead sponsor
Bayer
Industry
Eligibility
16 Years to 45 Years
Enrollment
510 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2011
U.S. locations
1
States / cities
Salt Lake City, Utah
Source: ClinicalTrials.gov public record
Updated Dec 18, 2018 · Synced Sep 6, 2026, 4:14 PM EDT
Not yet recruiting Phase 2 Interventional

Jaw Muscle Pain Post Wisdom Molar Surgery

NCT07094542
View directory record Official record
Conditions
Post Operative Pain, Impacted Third Molar Tooth, Muscle Pain
Interventions
Temporo-masseteric Nerve Block Injection, Oral Pain Medications only
Drug
Lead sponsor
Rutgers, The State University of New Jersey
Other
Eligibility
18 Years and older
Enrollment
80 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2026 – 2030
U.S. locations
1
States / cities
Newark, New Jersey
Source: ClinicalTrials.gov public record
Updated Jun 17, 2026 · Synced Sep 6, 2026, 4:14 PM EDT
Completed Phase 3 Interventional Results available

To Evaluate the Safety and Efficacy of Acetaminophen 650 mg and 1000mg in Dental Pain After Surgery

NCT01115673
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 Sep 6, 2026, 4:14 PM EDT
Withdrawn Phase 3 Interventional

Multimodal Analgesia in Shoulder Arthroplasty

NCT03586934
View directory record Official record
Conditions
Shoulder Pain, Opioid Use
Interventions
Acetaminophen, Celecoxib 200mg, Celecoxib 400 mg, Ropivacaine, Ketorolac, Acetaminophen Injectable Product, Oxycodone, Tramadol, Morphine Injectable Solution, hydrocodone bitartrate and acetaminophen, Morphine, Oxycodone Hydrochloride, Meloxicam
Drug
Lead sponsor
Rush University Medical Center
Other
Eligibility
18 Years and older
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018 – 2019
U.S. locations
1
States / cities
Chicago, Illinois
Source: ClinicalTrials.gov public record
Updated Sep 27, 2021 · Synced Sep 6, 2026, 4:14 PM EDT
Completed Phase 3 Interventional Results available

Ibuprofen/Acetaminophen Versus Nurofen Plus® and Panadeine® Extra Dental Pain Study

NCT01229449
View directory record Official record
Conditions
Post-operative Pain
Interventions
Ibuprofen/acetaminophen, Ibuprofen/acetaminophen (higher dose), Nurofen Plus®, Panadeine® Extra, Placebo
Drug
Lead sponsor
Reckitt Benckiser LLC
Industry
Eligibility
16 Years and older
Enrollment
678 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009
U.S. locations
1
States / cities
Austin, Texas
Source: ClinicalTrials.gov public record
Updated Sep 16, 2018 · Synced Sep 6, 2026, 4:14 PM EDT
Not listed Phase 3 Interventional

ACL-R Opioid Sparing Study

NCT06561035
View directory record Official record
Conditions
Anterior Cruciate Ligament Injuries
Interventions
Opiate Sparing, Opiate Based
Drug
Lead sponsor
Campbell Clinic
Other
Eligibility
14 Years to 85 Years
Enrollment
56 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2024 – 2026
U.S. locations
1
States / cities
Memphis, Tennessee
Source: ClinicalTrials.gov public record
Updated Aug 18, 2024 · Synced Sep 6, 2026, 4:14 PM EDT
Not listed Phase 4 Interventional

ZYNRELEF® for Postoperative Analgesia After Laparoscopic Sleeve Gastrectomy

NCT05863221
View directory record Official record
Conditions
Post Operative Pain, Acute, Bariatric Surgery Candidate, Postoperative Pain
Interventions
ZYNRELEF 200Mg-6Mg Extended-Release Solution
Drug
Lead sponsor
Dr. Yannis Raftopoulos
Other
Eligibility
18 Years and older
Enrollment
120 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2023 – 2024
U.S. locations
1
States / cities
Holyoke, Massachusetts
Source: ClinicalTrials.gov public record
Updated May 17, 2023 · Synced Sep 6, 2026, 4:14 PM EDT
Completed Not applicable Interventional Results available

STandard Versus No Opioid Prescription After Prolapse and Anti-INcontinence Surgery Trial

NCT04491617
View directory record Official record
Conditions
Postoperative Pain, Opioid Use, Prolapse; Female, Incontinence
Interventions
Standard opioid prescribing, Restrictive opioid prescribing
Other
Lead sponsor
The Cleveland Clinic
Other
Eligibility
18 Years and older · Female only
Enrollment
129 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2022
U.S. locations
1
States / cities
Cleveland, Ohio
Source: ClinicalTrials.gov public record
Updated Jan 23, 2025 · Synced Sep 6, 2026, 4:14 PM EDT
Recruiting Phase 1 Interventional Accepts healthy volunteers

A Research Study Looking Into How NNC0662-0419 Works With Birth Control Pills and Emptying of the Stomach in Women Not Able to Become Pregnant With Excess Body Weight

NCT07525791
View directory record Official record
Conditions
Overweight, Obesity
Interventions
NNC0662-0419, Oral contraceptive, Acetaminophen
Drug
Lead sponsor
Novo Nordisk A/S
Industry
Eligibility
18 Years to 64 Years · Female only
Enrollment
45 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2026 – 2027
U.S. locations
1
States / cities
Overland Park, Kansas
Source: ClinicalTrials.gov public record
Updated Apr 23, 2026 · Synced Sep 6, 2026, 4:14 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 6, 2026, 4:14 PM EDT
Completed Phase 2 Interventional Accepts healthy volunteers Results available

Dental Pain Study of Analgesics in Patients Undergoing Molar Removal

NCT03652818
View directory record Official record
Conditions
Dental Pain
Interventions
Pre-Op pregabalin, Pre-Op Placebo 1, Post-Op pregabalin, Post-Op Placebo 1, Post-Op Placebo 2, Post-Op acetaminophen
Drug
Lead sponsor
Nevakar, Inc.
Industry
Eligibility
17 Years to 55 Years
Enrollment
115 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2018
U.S. locations
1
States / cities
Salt Lake City, Utah
Source: ClinicalTrials.gov public record
Updated Nov 22, 2021 · Synced Sep 6, 2026, 4:14 PM EDT
Recruiting Not applicable Interventional

Office-Based Ureteroscopy Utilizing a Single Use Digital, Flexible Ureteroscope for Upper Tract Urothelial Carcinoma

NCT07630155
View directory record Official record
Conditions
Renal Pelvis and Ureter Urothelial Carcinoma
Interventions
Analgesic Agent, Electronic Health Record Review, Lidocaine Topical, Medical Device Usage and Evaluation, Survey Administration, Ureteroscopy
Drug · Other · Device + 1 more
Lead sponsor
University of Michigan Rogel Cancer Center
Other
Eligibility
18 Years and older
Enrollment
10 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2026 – 2027
U.S. locations
1
States / cities
Ann Arbor, Michigan
Source: ClinicalTrials.gov public record
Updated Jul 9, 2026 · Synced Sep 6, 2026, 4:14 PM EDT