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ClinicalTrials.gov public records Last synced Oct 20, 2026, 2:55 AM EDT

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Showing 1–24 of 275 matching trials from the live ClinicalTrials.gov search.
Filters: Intervention: Gastric Bypass Clear all
Withdrawn No phase listed Observational

Effect of Lap-Band Induced Weight Loss on Serum PSA Levels

NCT00562341
View directory record Official record
Conditions
Obesity, Prostate Cancer
Interventions
Bariatric Surgery
Other
Lead sponsor
Maimonides Medical Center
Other
Eligibility
20 Years to 60 Years · Male only
Healthy volunteers
Healthy volunteers not accepted
Timeline
2007 – 2009
U.S. locations
1
States / cities
Brooklyn, New York
Source: ClinicalTrials.gov public record
Updated Aug 23, 2018 · Synced Oct 20, 2026, 2:55 AM EDT
Recruiting Early Phase 1 Interventional Accepts healthy volunteers

Glucagon-like Peptide 1, Glucose Metabolism and Gastric Bypass

NCT01803451
View directory record Official record
Conditions
Post-bariatric Surgery
Interventions
exendin -(9-39)
Drug
Lead sponsor
The University of Texas Health Science Center at San Antonio
Other
Eligibility
18 Years to 65 Years
Enrollment
80 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2005 – 2027
U.S. locations
2
States / cities
San Antonio, Texas
Source: ClinicalTrials.gov public record
Updated Sep 9, 2025 · Synced Oct 20, 2026, 2:55 AM EDT
Active, not recruiting Not applicable Interventional

Randomized Trial of EUS-guided Gastrojejunostomy and Surgical Gastrojejunostomy in Gastric Outlet Obstruction

NCT05548114
View directory record Official record
Conditions
Gastric Outlet Obstruction
Interventions
EUS-guided gastrojejunostomy, Surgical gastrojejunostomy
Procedure
Lead sponsor
Orlando Health, Inc.
Other
Eligibility
18 Years and older
Enrollment
74 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2022 – 2025
U.S. locations
1
States / cities
Orlando, Florida
Source: ClinicalTrials.gov public record
Updated Jun 12, 2025 · Synced Oct 20, 2026, 2:55 AM EDT
Withdrawn No phase listed Observational

Mechanisms of Diabetes Control After Weight Loss Surgery, Sub-study #1

NCT01930448
View directory record Official record
Conditions
Gastric Bypass Surgery, Gastric Banding, Type 2 Diabetes
Interventions
Not listed
Lead sponsor
St. Luke's-Roosevelt Hospital Center
Other
Eligibility
20 Years to 60 Years
Healthy volunteers
Healthy volunteers not accepted
Timeline
2008 – 2014
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Sep 11, 2015 · Synced Oct 20, 2026, 2:55 AM 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 31, 2014 · Synced Oct 20, 2026, 2:55 AM EDT
Completed Phase 4 Interventional Results available

A Pilot Study of the Efficacy of Alli in the Management of Pre-operative Weight Loss Required for Bariatric Surgery.

NCT01035333
View directory record Official record
Conditions
Obesity
Interventions
Orlistat
Drug
Lead sponsor
Albany College of Pharmacy and Health Sciences
Other
Eligibility
18 Years and older
Enrollment
19 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009 – 2011
U.S. locations
1
States / cities
Albany, New York
Source: ClinicalTrials.gov public record
Updated Apr 4, 2014 · Synced Oct 20, 2026, 2:55 AM EDT
Active, not recruiting No phase listed Observational

Comparison of Body Composition Changes With Weight Loss Interventions

NCT07115069
View directory record Official record
Conditions
Obesity
Interventions
GLP-1 receptor agonist, Gastric Bypass Surgery (laparoscopic), Gastric Bypass Surgery (robotic)
Drug · Procedure
Lead sponsor
Vanderbilt University Medical Center
Other
Eligibility
21 Years to 65 Years
Enrollment
60 participants
Timeline
2025 – 2027
U.S. locations
1
States / cities
Nashville, Tennessee
Source: ClinicalTrials.gov public record
Updated Jul 14, 2026 · Synced Oct 20, 2026, 2:55 AM EDT
Recruiting Not applicable Interventional

GI Oxalate Absorption

NCT05356000
View directory record Official record
Conditions
Bariatric Surgery Candidate, Kidney Stone
Interventions
Special low-oxalate diet followed by all-day visit to University of Chicago research clinic
Other
Lead sponsor
University of Chicago
Other
Eligibility
18 Years to 70 Years
Enrollment
30 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2023 – 2026
U.S. locations
1
States / cities
Chicago, Illinois
Source: ClinicalTrials.gov public record
Updated Aug 19, 2025 · Synced Oct 20, 2026, 2:55 AM EDT
Completed Phase 1Phase 2 Interventional Results available

Oxazyme in Patients With Hyperoxaluria

NCT01127087
View directory record Official record
Conditions
Hyperoxaluria
Interventions
Oxazyme
Drug
Lead sponsor
Mayo Clinic
Other
Eligibility
18 Years and older
Enrollment
22 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2010 – 2011
U.S. locations
1
States / cities
Rochester, Minnesota
Source: ClinicalTrials.gov public record
Updated Dec 24, 2012 · Synced Oct 20, 2026, 2:55 AM EDT
Recruiting No phase listed Observational Accepts healthy volunteers

The Metabolic and Genetic Drivers of Body Composition Changes Following Weight Loss Surgery

NCT07178704
View directory record Official record
Conditions
Bariatric Surgery Patients
Interventions
Not listed
Lead sponsor
The University of Texas Medical Branch, Galveston
Other
Eligibility
18 Years to 65 Years
Enrollment
100 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2025 – 2027
U.S. locations
1
States / cities
Galveston, Texas
Source: ClinicalTrials.gov public record
Updated Jul 10, 2026 · Synced Oct 20, 2026, 2:55 AM EDT
Completed Phase 2Phase 3 Interventional Results available

Study on the Use of Low Dose Ketamine After Gastric Bypass and Gastrectomy

NCT02452060
View directory record Official record
Conditions
Pain, Postoperative Depression
Interventions
Ketamine, Placebo Comparator
Drug · Other
Lead sponsor
NYU Langone Health
Other
Eligibility
18 Years to 65 Years
Enrollment
90 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2014 – 2017
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Mar 16, 2020 · Synced Oct 20, 2026, 2:55 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available

A Cohort Study of Weight Loss and Gliosis

NCT03578887
View directory record Official record
Conditions
Obesity, Gliosis, Weight-Loss
Interventions
Behavioral Weight Loss Program, Roux-en-Y Gastric Bypass or Sleeve Gastrectomy
Behavioral · Procedure
Lead sponsor
University of Washington
Other
Eligibility
25 Years to 64 Years
Enrollment
112 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2019 – 2025
U.S. locations
1
States / cities
Seattle, Washington
Source: ClinicalTrials.gov public record
Updated Sep 4, 2025 · Synced Oct 20, 2026, 2:55 AM 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 13, 2016 · Synced Oct 20, 2026, 2:55 AM EDT
Completed Not applicable Interventional

Enhanced Recovery After Surgery in Laparoscopic Sleeve Gastrectomy

NCT03520803
View directory record Official record
Conditions
Obesity
Interventions
Enhanced recovery after surgery protocol
Other
Lead sponsor
Hartford Hospital
Other
Eligibility
18 Years to 70 Years
Enrollment
132 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2019 – 2020
U.S. locations
1
States / cities
Hartford, Connecticut
Source: ClinicalTrials.gov public record
Updated Feb 9, 2021 · Synced Oct 20, 2026, 2:55 AM EDT
Completed Not applicable Interventional Results available

Pancreatic Enzymes to Restore Digestive Function in Malnourished Gastric Bypass Patients

NCT00510744
View directory record Official record
Conditions
Obesity
Interventions
pancreatic enzyme supplement
Drug
Lead sponsor
University of Pittsburgh
Other
Eligibility
18 Years to 65 Years
Enrollment
5 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2007 – 2015
U.S. locations
1
States / cities
Pittsburgh, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Jun 2, 2016 · Synced Oct 20, 2026, 2:55 AM EDT
Completed No phase listed Observational Results available

Bariatric Surgery for Morbid Obesity

NCT00675558
View directory record Official record
Conditions
Obesity, Morbid Obesity
Interventions
Initial Surgery, Second Bariatric Surgery
Procedure
Lead sponsor
Columbia University
Other
Eligibility
18 Years to 75 Years
Enrollment
50 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2006 – 2012
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Jul 26, 2013 · Synced Oct 20, 2026, 2:55 AM EDT
Completed No phase listed Observational

Microenvironment of Adipose Tissue in Endocannabinoid System

NCT00978289
View directory record Official record
Conditions
Obesity
Interventions
Not listed
Lead sponsor
Vanderbilt University
Other
Eligibility
20 Years to 60 Years
Enrollment
20 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2008 – 2012
U.S. locations
1
States / cities
Nashville, Tennessee
Source: ClinicalTrials.gov public record
Updated Jun 19, 2013 · Synced Oct 20, 2026, 2:55 AM EDT
Terminated No phase listed Observational

Modeling the Neurological Basis and Characterizing the Neurological Phenotype of Obesity Using Human Neural Stem Cells

NCT03263390
View directory record Official record
Conditions
Obesity, Morbid
Interventions
Bariatric Surgery, Anti Obesity Drugs
Procedure · Drug
Lead sponsor
University of California, San Diego
Other
Eligibility
18 Years to 90 Years
Enrollment
6 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017 – 2020
U.S. locations
1
States / cities
La Jolla, California
Source: ClinicalTrials.gov public record
Updated Dec 16, 2020 · Synced Oct 20, 2026, 2:55 AM EDT
Withdrawn Phase 4 Interventional

Changes in Oral Contraceptive Hormones After Gastric Bypass Surgery

NCT01941134
View directory record Official record
Conditions
Bariatric Surgery Candidate, Contraception
Interventions
ethinyl estradiol-levonorgestrel
Drug
Lead sponsor
Johns Hopkins University
Other
Eligibility
18 Years to 40 Years · Female only
Healthy volunteers
Healthy volunteers not accepted
Timeline
2013 – 2017
U.S. locations
1
States / cities
Baltimore, Maryland
Source: ClinicalTrials.gov public record
Updated Mar 21, 2018 · Synced Oct 20, 2026, 2:55 AM EDT
Completed Phase 3 Interventional

Pharmacokinetic Properties of Sertraline Before and After Gastric Bypass Surgery

NCT01214382
View directory record Official record
Conditions
Roux en Y Gastric Bypass Surgery
Interventions
Sertraline
Drug
Lead sponsor
North Dakota State University
Other
Eligibility
18 Years to 60 Years
Enrollment
31 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2010 – 2014
U.S. locations
1
States / cities
Fargo, North Dakota
Source: ClinicalTrials.gov public record
Updated Apr 6, 2016 · Synced Oct 20, 2026, 2:55 AM EDT
Completed No phase listed Observational

Perforated Marginal Ulcer After Gastric Bypass

NCT01041196
View directory record Official record
Conditions
Ulcer Disease After Gastric Bypass, Marginal Ulcer, Perforated Marginal Ulcer, Acutely Perforated Marginal Ulcer
Interventions
Not listed
Lead sponsor
University of California, San Francisco
Other
Eligibility
18 Years to 65 Years
Enrollment
30 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009
U.S. locations
1
States / cities
Fresno, California
Source: ClinicalTrials.gov public record
Updated Jan 1, 2010 · Synced Oct 20, 2026, 2:55 AM EDT
Terminated No phase listed Observational Accepts healthy volunteers

BAriatric Surgery Induced Chromosomal Change

NCT05903521
View directory record Official record
Conditions
Obesity, Morbid
Interventions
Not listed
Lead sponsor
The Cleveland Clinic
Other
Eligibility
18 Years and older
Enrollment
120 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2023 – 2025
U.S. locations
1
States / cities
Weston, Florida
Source: ClinicalTrials.gov public record
Updated Oct 24, 2025 · Synced Oct 20, 2026, 2:55 AM EDT
Completed Phase 1 Interventional

Study to Examine the Effect of Gastric Bypass Surgery on Venlafaxine ER Blood Levels

NCT01867255
View directory record Official record
Conditions
Bariatric Surgery, Gastric Bypass, Roux-en-Y Gastric Bypass
Interventions
venlafaxine ER (extended-release) 75 mg
Drug
Lead sponsor
Mayo Clinic
Other
Eligibility
18 Years and older
Enrollment
10 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2013 – 2015
U.S. locations
1
States / cities
Rochester, Minnesota
Source: ClinicalTrials.gov public record
Updated Dec 23, 2015 · Synced Oct 20, 2026, 2:55 AM EDT
Completed Not applicable Interventional

Changes in Gut Hormones, Body Composition and Energy Expenditure After Roux-en-Y

NCT02048501
View directory record Official record
Conditions
Obesity, Weight Loss
Interventions
Resting Metabolic Rate (RMR), Duel-energy x-ray absorptiometry (DEXA), Visual Analog Scale (VAS), Meal Stimulation Test
Other
Lead sponsor
Duke University
Other
Eligibility
18 Years to 65 Years
Enrollment
57 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2014 – 2015
U.S. locations
1
States / cities
Durham, North Carolina
Source: ClinicalTrials.gov public record
Updated Apr 26, 2017 · Synced Oct 20, 2026, 2:55 AM EDT