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Showing 1–24 of 238 matching trials from the live ClinicalTrials.gov search.
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Filters: Intervention: gastric bypass surgery Clear all
Completed Not applicable Interventional

Treatment of Low Metabolic Rate Following Bariatric Surgery

NCT01596907
View directory record Official record
Conditions
Morbid Obesity
Interventions
Ephedrine sulfate with caffeine, cellulose
Drug
Lead sponsor
Oregon Weight Loss Surgery, LLC
Other
Eligibility
18 Years to 70 Years
Enrollment
218 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2012 – 2015
U.S. locations
2
States / cities
Beaverton, Oregon • Portland, Oregon
Source: ClinicalTrials.gov public record
Updated Sep 23, 2015 · Synced Sep 23, 2026, 8:53 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 23, 2026, 8:53 PM EDT
Active, not recruiting No phase listed Observational

Biological Sample Repository for Gastrointestinal Disorders

NCT05874726
View directory record Official record
Conditions
Obesity, Obesity, Morbid, Obesity, Primary, Gastro-Intestinal Disorder, Overweight and Obesity, Overweight, Overweight or Obesity, Diabetes Type 2, Diabetes Mellitus, Diabetes Mellitus, Type 2, Hypertension, Hyperlipidemias, Sleep Apnea, GERD, Gastroesophageal Reflux, Musculoskeletal Pain Disorder, Cancer
Interventions
Blood Collection, Urine Collection, Tissue Sample Collection
Diagnostic Test
Lead sponsor
Pichamol Jirapinyo, MD, MPH
Other
Eligibility
18 Years and older
Enrollment
500 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2023 – 2029
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Dec 1, 2025 · Synced Sep 23, 2026, 8:53 PM EDT
Recruiting Not applicable Interventional

Comparing Endoscopic Ultrasound vs Surgical Gastrojejunostomy for Management of GOO.

NCT06128018
View directory record Official record
Conditions
Malignant Gastric Outlet Obstruction
Interventions
Surgical gastrojejunostomy (S-GJ), EUS-guided gastrojejunostomy (EUS-GJ)
Procedure
Lead sponsor
AdventHealth
Other
Eligibility
18 Years and older
Enrollment
70 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2023 – 2027
U.S. locations
1
States / cities
Orlando, Florida
Source: ClinicalTrials.gov public record
Updated Sep 3, 2026 · Synced Sep 23, 2026, 8:53 PM EDT
Completed Not applicable Interventional

Improvement of Insulin Resistance After Bariatric Surgery

NCT03853590
View directory record Official record
Conditions
Obesity, Bariatric Surgery Candidate, Insulin Tolerance
Interventions
Roux-en-Y gastric bypass, Laparoscopic adjustable gastric banding
Procedure
Lead sponsor
Beth Israel Deaconess Medical Center
Other
Eligibility
18 Years to 65 Years
Enrollment
42 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2010 – 2015
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Feb 24, 2019 · Synced Sep 23, 2026, 8:53 PM EDT
Not listed No phase listed Observational Accepts healthy volunteers

Effects of Alcohol After Bariatric Surgery

NCT01843257
View directory record Official record
Conditions
Obesity
Interventions
Alcohol challenge test Alcohol visit first, Alcohol challenge test Placebo visit first
Other
Lead sponsor
University of Illinois at Urbana-Champaign
Other
Eligibility
21 Years to 65 Years · Female only
Enrollment
100 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2013 – 2021
U.S. locations
1
States / cities
St Louis, Missouri
Source: ClinicalTrials.gov public record
Updated Apr 26, 2021 · Synced Sep 23, 2026, 8:53 PM EDT
Not listed Phase 3 Interventional

Randomized Controlled Trial of Laparoscopic Gastric Bypass Plus Omentectomy Versus Laparoscopic Gastric Bypass Alone in Improving Diabetic Indices

NCT00552942
View directory record Official record
Conditions
Diabetes, Interleukins, Cytokines
Interventions
laparoscopic gastric bypass plus omentectomy
Procedure
Lead sponsor
Legacy Health System
Other
Eligibility
18 Years and older
Enrollment
40 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2006 – 2008
U.S. locations
1
States / cities
Portland, Oregon
Source: ClinicalTrials.gov public record
Updated Nov 1, 2007 · Synced Sep 23, 2026, 8:53 PM EDT
Completed No phase listed Observational

Small Bowel Length and Bariatric Surgery Outcomes

NCT02872493
View directory record Official record
Conditions
Malnutrition, Obesity, Weight Loss, Micronutrient Deficiency
Interventions
Small bowel length measurement
Procedure
Lead sponsor
Vanderbilt University Medical Center
Other
Eligibility
18 Years and older
Enrollment
470 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2016 – 2025
U.S. locations
1
States / cities
Nashville, Tennessee
Source: ClinicalTrials.gov public record
Updated Jul 7, 2025 · Synced Sep 23, 2026, 8:53 PM EDT
Completed No phase listed Observational

Using Fitbit to Monitor Ambulation in Patients After Surgery.

NCT02741895
View directory record Official record
Conditions
General Surgery
Interventions
Fitbit monitoring
Behavioral
Lead sponsor
Cedars-Sinai Medical Center
Other
Eligibility
18 Years and older
Enrollment
135 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2016 – 2017
U.S. locations
1
States / cities
Los Angeles, California
Source: ClinicalTrials.gov public record
Updated Jan 29, 2018 · Synced Sep 23, 2026, 8:53 PM EDT
Recruiting Not applicable Interventional

Lexion AP 50/30 Warmed Humidified Real Time CO2 Insufflation vs Airseal Recirculated CO2/Air Insufflation in Minimally Invasive Bariatric (Gastric Bypass) Surgery

NCT05838300
View directory record Official record
Conditions
Bariatric Surgery
Interventions
Warm humidified CO2, Dry CO2
Device
Lead sponsor
The University of Texas Health Science Center, Houston
Other
Eligibility
18 Years to 65 Years
Enrollment
54 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2023 – 2025
U.S. locations
1
States / cities
Houston, Texas
Source: ClinicalTrials.gov public record
Updated Jun 12, 2025 · Synced Sep 23, 2026, 8:53 PM EDT
Completed Not applicable Interventional

Effect of Number of Meals on Metabolism After Weight Loss Surgery

NCT02929212
View directory record Official record
Conditions
Morbid Obesity
Interventions
Solid Meal, Liquid Meal, Acetaminophen, Single, 600 kcal meal, Multiple, 200 kcal meals
Other · Drug
Lead sponsor
Columbia University
Other
Eligibility
21 Years to 60 Years
Enrollment
33 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009 – 2014
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Jan 31, 2017 · Synced Sep 23, 2026, 8:53 PM EDT
Completed No phase listed Observational

Mechanisms of Glycemic Improvement After Gastrointestinal Surgery

NCT01025999
View directory record Official record
Conditions
Diabetes Mellitus, Type II
Interventions
No intervention
Other
Lead sponsor
University of Washington
Other
Eligibility
18 Years and older
Enrollment
7 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2010 – 2015
U.S. locations
1
States / cities
Seattle, Washington
Source: ClinicalTrials.gov public record
Updated Mar 30, 2016 · Synced Sep 23, 2026, 8:53 PM EDT
Completed No phase listed Observational

Endotoxin and Intestinal Flora Before and After Gastric Bypass or Banding in Diabetics

NCT00960765
View directory record Official record
Conditions
Obesity, Morbid, Diabetes Mellitus, Type 2, Gastric Bypass
Interventions
Not listed
Lead sponsor
CPL Associates
Other
Eligibility
18 Years to 95 Years
Enrollment
15 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009 – 2015
U.S. locations
2
States / cities
Buffalo, New York • Williamsville, New York
Source: ClinicalTrials.gov public record
Updated Jan 27, 2016 · Synced Sep 23, 2026, 8:53 PM EDT
Terminated No phase listed Observational

Study Evaluating Metabolic Syndrome in Subjects Undergoing Gastric Bypass Bariatric Syndrome

NCT00283374
View directory record Official record
Conditions
Morbid Obesity, Metabolic Disease
Interventions
Laparoscopic Roux-en-Y Gastric Bypass
Procedure
Lead sponsor
Wyeth is now a wholly owned subsidiary of Pfizer
Industry
Eligibility
18 Years to 55 Years
Enrollment
120 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
Started 2005
U.S. locations
10
States / cities
Irvine, California • Orange, California • Atlanta, Georgia + 6 more
Source: ClinicalTrials.gov public record
Updated May 17, 2006 · Synced Sep 23, 2026, 8:53 PM EDT
Completed No phase listed Observational Accepts healthy volunteers

Prospective Study of Hormone Levels After Bariatric Surgery

NCT00627315
View directory record Official record
Conditions
Obesity
Interventions
Gastric bypass, Gastric banding
Procedure
Lead sponsor
Columbia University
Other
Eligibility
18 Years and older
Enrollment
236 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2003 – 2018
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Sep 18, 2019 · Synced Sep 23, 2026, 8:53 PM EDT
Recruiting Phase 3 Interventional

Trial of IV vs Oral Iron Treatment of Iron Deficiency Anemia in the Post-Operative Bariatric Surgical Patient

NCT04268849
View directory record Official record
Conditions
Iron Deficiency Anemia
Interventions
Ferumoxytol, Saline, Ferrous sulfate tablets, Vitamin C
Drug
Lead sponsor
Auerbach Hematology Oncology Associates P C
Other
Eligibility
18 Years and older
Enrollment
104 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2026
U.S. locations
1
States / cities
Baltimore, Maryland
Source: ClinicalTrials.gov public record
Updated Oct 2, 2025 · Synced Sep 23, 2026, 8:53 PM EDT
Completed Phase 3 Interventional Accepts healthy volunteers Results available

A Preliminary Comparison of the Blood Levels of Medications in Obese Subjects Compared to Post-Gastric Bypass Subjects

NCT01015976
View directory record Official record
Conditions
Obesity
Interventions
bariatric surgery, control
Procedure · Other
Lead sponsor
Neuropsychiatric Research Institute, Fargo, North Dakota
Other
Eligibility
18 Years to 60 Years
Enrollment
10 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2009 – 2010
U.S. locations
1
States / cities
Fargo, North Dakota
Source: ClinicalTrials.gov public record
Updated Mar 30, 2014 · Synced Sep 23, 2026, 8:53 PM EDT
Completed Not applicable Interventional

Determinants of Fat Malabsorption After Roux-en-Y Gastric Bypass

NCT01252511
View directory record Official record
Conditions
Severe Obesity
Interventions
RYGB for surgical treatment of severe obesity
Procedure
Lead sponsor
Baylor Research Institute
Other
Eligibility
18 Years to 65 Years
Enrollment
20 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2011 – 2017
U.S. locations
1
States / cities
Dallas, Texas
Source: ClinicalTrials.gov public record
Updated May 16, 2019 · Synced Sep 23, 2026, 8:53 PM EDT
Withdrawn No phase listed Observational

Omega-3 Fatty Acid Status in Morbid Obesity Before and After Surgical Treatment

NCT00558532
View directory record Official record
Conditions
Morbid Obesity, Cardiovascular Disease, Fatty Acid Levels
Interventions
Bariatric Surgery
Procedure
Lead sponsor
University of Cincinnati
Other
Eligibility
Not listed
Healthy volunteers
Healthy volunteers not accepted
Timeline
2007 – 2008
U.S. locations
1
States / cities
Cincinnati, Ohio
Source: ClinicalTrials.gov public record
Updated Jun 12, 2016 · Synced Sep 23, 2026, 8:53 PM EDT
Not listed No phase listed Observational Accepts healthy volunteers

A Retrospective Multicenter Comparison of Laparoscopic and Robotic-Assisted Roux-en-Y Gastrectomy

NCT05224791
View directory record Official record
Conditions
Laparoscopic Sleeve Gastrectomy, Sleeve Gastrectomy
Interventions
Roux-en-Y Gastric Bypass, Sleeve Gastrectomy
Procedure
Lead sponsor
Methodist Health System
Other
Eligibility
18 Years and older
Enrollment
400 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020 – 2025
U.S. locations
1
States / cities
Dallas, Texas
Source: ClinicalTrials.gov public record
Updated Mar 27, 2024 · Synced Sep 23, 2026, 8:53 PM EDT
Terminated No phase listed Observational

Studies of Biological Changes Related to Weight Loss After Gastric Bypass Surgery

NCT00120562
View directory record Official record
Conditions
Obesity, Morbid Obesity, Weight Loss
Interventions
Gastric Bypass Surgery
Procedure
Lead sponsor
Rockefeller University
Other
Eligibility
18 Years to 65 Years
Enrollment
13 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
Started 2007
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Aug 27, 2009 · Synced Sep 23, 2026, 8:53 PM EDT
Completed Phase 4 Interventional

A Trial of the Cost Effectiveness of IV Acetaminophen in Bariatric Surgery

NCT02233400
View directory record Official record
Conditions
Hospital Costs, Length of Stay, Postoperative Pain Score, Patient Satisfaction
Interventions
Acetaminophen
Drug
Lead sponsor
St. Luke's Hospital and Health Network, Pennsylvania
Other
Eligibility
18 Years to 80 Years
Enrollment
113 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2013 – 2014
U.S. locations
2
States / cities
Allentown, Pennsylvania • Bethlehem, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Sep 7, 2014 · Synced Sep 23, 2026, 8:53 PM EDT
Terminated Phase 1 Interventional Results available

Orthostatic Intolerance After Bariatric Surgery

NCT03808740
View directory record Official record
Conditions
Orthostatic Intolerance
Interventions
Atomoxetine, Placebo
Drug
Lead sponsor
Vanderbilt University Medical Center
Other
Eligibility
18 Years to 60 Years
Enrollment
10 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018 – 2021
U.S. locations
1
States / cities
Nashville, Tennessee
Source: ClinicalTrials.gov public record
Updated Sep 26, 2024 · Synced Sep 23, 2026, 8:53 PM EDT
Enrolling by invitation No phase listed Observational

Endoscopic Metabolic and Bariatric Therapies

NCT05725967
View directory record Official record
Conditions
Obesity, Obesity, Morbid, Obesity Associated Disorder, Bariatric Surgery Candidate, Fistula, Gastric, Roux-en-y Anastomosis Site, Ulcer, Gastric, Abdominal Pain, Abdominal Obesity, Complication of Surgical Procedure, Complication of Treatment, Complication,Postoperative, Weight Gain, Weight Loss, Leak, Anastomotic, Delayed Gastric Emptying Following Procedure
Interventions
Primary Obesity Endoscopic Procedures, Endoscopic Revision of Bariatric Surgical Procedures, Bariatric Surgery Procedures, Endoscopic Sleeve Gastroplasty, Trans-oral Outlet Reduction, Intragastric Balloon, Primary obesity surgery endoluminal, Restorative obesity surgery endoluminal, Argon Plasma Coagulation, Gastroplasty with Endoscopic Myotomy, Bariatric Endoscopic Antral Myotomy, Pylorus Sparing Antral Myotomy, Aspiration Therapy
Procedure · Device
Lead sponsor
Christopher C. Thompson, MD, MSc
Other
Eligibility
18 Years to 80 Years
Enrollment
5,000 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2022 – 2029
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Dec 1, 2025 · Synced Sep 23, 2026, 8:53 PM EDT