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Showing 1–24 of 66 matching trials from the live ClinicalTrials.gov search.
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Filters: Intervention: Phentermine Clear all
Completed Phase 4 Interventional Results available

Studying the Effects of Phentermine on Eating Behavior

NCT01886937
View directory record Official record
Conditions
Obesity
Interventions
Phentermine, placebo
Drug
Lead sponsor
New York State Psychiatric Institute
Other
Eligibility
18 Years to 60 Years
Enrollment
13 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2012 – 2014
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Jul 30, 2017 · Synced Sep 1, 2026, 10:28 PM EDT
Recruiting Phase 4 Interventional

Individualized Pharmacological Approach to Obesity in Patients With Bipolar Disorder

NCT07213466
View directory record Official record
Conditions
Bipolar I Disorder, Bipolar II Disorder, Schizo Affective Disorder, Obesity, Weight Loss, GLP - 1
Interventions
Group Therapy Program, semaglutide, Phentermine-Topiramate, naltrexone and bupropion (combination)
Behavioral · Drug
Lead sponsor
Mayo Clinic
Other
Eligibility
18 Years to 65 Years
Enrollment
100 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2026 – 2029
U.S. locations
1
States / cities
Rochester, Minnesota
Source: ClinicalTrials.gov public record
Updated Mar 10, 2026 · Synced Sep 1, 2026, 10:28 PM EDT
Completed Phase 2 Interventional

Phentermine/Topiramate Extended Release in Binge Eating Disorder (BED)

NCT02659475
View directory record Official record
Conditions
Binge Eating Disorder
Interventions
PHEN/TPM ER (Qsymia®)
Drug
Lead sponsor
Lindner Center of HOPE
Other
Eligibility
18 Years to 65 Years
Enrollment
10 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2015 – 2016
U.S. locations
1
States / cities
Mason, Ohio
Source: ClinicalTrials.gov public record
Updated Sep 19, 2016 · Synced Sep 1, 2026, 10:28 PM EDT
Not yet recruiting Phase 4 Interventional

Switching to Oral Weight Management Pharmacotherapy to Prevent Weight Regain After GLP-1 Therapy Discontinuation

NCT07729332
View directory record Official record
Conditions
Obesity
Interventions
Phentermine Pill, Orforglipron
Drug
Lead sponsor
Massachusetts General Hospital
Other
Eligibility
18 Years to 80 Years
Enrollment
60 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2026 – 2031
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Jul 26, 2026 · Synced Sep 1, 2026, 10:28 PM EDT
Completed Phase 4 Interventional Results available

A Toolbox Approach to Obesity Treatment in Primary Care

NCT01922934
View directory record Official record
Conditions
Obesity
Interventions
Commercial weight loss program, Colorado Weigh, Meal replacements, Obesity pharmacotherapy, Recreation center passes
Behavioral · Dietary Supplement · Drug
Lead sponsor
Denver Health and Hospital Authority
Other
Eligibility
18 Years to 80 Years
Enrollment
4,730 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2014 – 2016
U.S. locations
1
States / cities
Denver, Colorado
Source: ClinicalTrials.gov public record
Updated Aug 17, 2017 · Synced Sep 1, 2026, 10:28 PM EDT
Completed Phase 3 Interventional Results available

Study of VI-0521 Compared to Placebo in Treatment of Obesity in Adults

NCT00554216
View directory record Official record
Conditions
Obesity
Interventions
VI-0521, Placebo matched phentermine/topiramate
Drug
Lead sponsor
VIVUS LLC
Industry
Eligibility
18 Years to 70 Years
Enrollment
1,267 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2007 – 2009
U.S. locations
5
States / cities
San Diego, California • Ridgefield, Connecticut • Durham, North Carolina + 2 more
Source: ClinicalTrials.gov public record
Updated Sep 9, 2012 · Synced Sep 1, 2026, 10:28 PM EDT
Withdrawn Phase 2 Interventional Accepts healthy volunteers

Phentermine/Topiramate as Preventive Pharmacotherapy for Obesity

NCT05834062
View directory record Official record
Conditions
Obesity, Adolescent
Interventions
Qsymia and lifestyle management therapy, Placebo and lifestyle management therapy
Drug · Behavioral
Lead sponsor
University of Minnesota
Other
Eligibility
16 Years to 22 Years
Healthy volunteers
Accepts healthy volunteers
Timeline
2023 – 2027
U.S. locations
1
States / cities
Minneapolis, Minnesota
Source: ClinicalTrials.gov public record
Updated Oct 25, 2023 · Synced Sep 1, 2026, 10:28 PM EDT
Completed Phase 4 Interventional Results available

A Pharmacokinetic Study Comparing VI-0521 With Placebo in Obese Adolescents

NCT02714062
View directory record Official record
Conditions
Pediatric Obesity, Childhood Obesity
Interventions
Placebo, VI-0521 Mid Dose, VI-0521 Top Dose
Drug
Lead sponsor
VIVUS LLC
Industry
Eligibility
12 Years to 17 Years
Enrollment
42 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2016
U.S. locations
4
States / cities
Baton Rouge, Louisiana • Marrero, Louisiana • Cincinnati, Ohio + 1 more
Source: ClinicalTrials.gov public record
Updated Aug 22, 2022 · Synced Sep 1, 2026, 10:28 PM EDT
Completed Phase 4 Interventional Results available

A Phase IV Safety and Efficacy Study of VI-0521 in Adolescents With Obesity

NCT03922945
View directory record Official record
Conditions
Adolescent Obesity, Obesity in Adolescence, Adolescent Overweight
Interventions
VI-0521 oral capsule, Placebo oral capsule, Lifestyle Modification
Drug · Behavioral
Lead sponsor
VIVUS LLC
Industry
Eligibility
12 Years to 16 Years
Enrollment
223 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2019 – 2021
U.S. locations
1
States / cities
Norman, Oklahoma
Source: ClinicalTrials.gov public record
Updated Sep 9, 2022 · Synced Sep 1, 2026, 10:28 PM EDT
Active, not recruiting Phase 4 Interventional

Sequential or CombinaTion Anti-obesitY Medication With Muscle Preservation for Weight Loss and MaintEnance: A PragmAtic Randomized CoNtrolled Trial (STAY-LEAN Trial)

NCT06854614
View directory record Official record
Conditions
Obesity
Interventions
Comprehensive weight loss, Enhanced lifestyle changes, Phentermine-Topiramate, Naltrexone-Bupropion Combination, Orlistat
Other · Drug
Lead sponsor
The Cleveland Clinic
Other
Eligibility
25 Years to 65 Years
Enrollment
150 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2025 – 2028
U.S. locations
1
States / cities
Cleveland, Ohio
Source: ClinicalTrials.gov public record
Updated Dec 11, 2025 · Synced Sep 1, 2026, 10:28 PM EDT
Recruiting Phase 4 Interventional

Optimizing Portal Hypertension With TIPS and Interval Metabolic Surgery for Advanced Liver Disease

NCT07058155
View directory record Official record
Conditions
Liver Cirrhoses, Portal Hypertension Related to Cirrhosis, Severe Obesity, TIPS
Interventions
Transjugular Intrahepatic Portosystemic Shunt (TIPS), Sleeve Gastrectomy, Anti-Obesity Pharmacotherapy (Class Effect), Lifestyle Counseling - Diet & Physical-Activity Program
Procedure · Drug · Behavioral
Lead sponsor
The Cleveland Clinic
Other
Eligibility
18 Years to 70 Years
Enrollment
70 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2025 – 2034
U.S. locations
1
States / cities
Cleveland, Ohio
Source: ClinicalTrials.gov public record
Updated Dec 22, 2025 · Synced Sep 1, 2026, 10:28 PM EDT
Completed Phase 2 Interventional Results available

Adjunct Phentermine + Topiramate After Bariatric Surgery in 12-24 Year Olds

NCT04095104
View directory record Official record
Conditions
Obesity, Morbid, Bariatric Surgery, Adolescent, Young Adult, Drug Therapy
Interventions
Phentermine, Immediate Release Topiramate, Placebo for Phentermine, Placebo for Immediate Release Topiramate
Drug
Lead sponsor
University of Colorado, Denver
Other
Eligibility
12 Years to 24 Years
Enrollment
13 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2022
U.S. locations
1
States / cities
Aurora, Colorado
Source: ClinicalTrials.gov public record
Updated May 22, 2025 · Synced Sep 1, 2026, 10:28 PM EDT
Withdrawn Phase 4 Interventional

Treating Toddler Obesity by Treating the Parent/Caregiver Obesity With Weight Loss Medications

NCT06768320
View directory record Official record
Conditions
Weight Loss, Obesity, Childhood, Obesity
Interventions
Lomaira 8Mg Tablet
Drug
Lead sponsor
Loma Linda University
Other
Eligibility
12 Months to 75 Years
Healthy volunteers
Healthy volunteers not accepted
Timeline
2025 – 2027
U.S. locations
2
States / cities
Loma Linda, California
Source: ClinicalTrials.gov public record
Updated Nov 19, 2025 · Synced Sep 1, 2026, 10:28 PM EDT
Completed Phase 2 Interventional

A Study to Examine the Safety, Tolerability, and Body Weight Effect of Pramlintide Alone and in Combination With Oral Antiobesity Agents in Overweight and Obese Subjects

NCT00402077
View directory record Official record
Conditions
Overweight, Obesity
Interventions
pramlintide acetate, sibutramine, phentermine, placebo
Drug
Lead sponsor
AstraZeneca
Industry
Eligibility
18 Years to 65 Years
Enrollment
258 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2006 – 2007
U.S. locations
16
States / cities
Birmingham, Alabama • Phoenix, Arizona • Chula Vista, California + 13 more
Source: ClinicalTrials.gov public record
Updated Mar 5, 2015 · Synced Sep 1, 2026, 10:28 PM EDT
Completed Phase 3 Interventional Results available

A Study Comparing Multiple Doses of VI-0521 With Placebo and Their Single-agent Constituents for Treatment of Obesity in Adults

NCT00563368
View directory record Official record
Conditions
Obesity
Interventions
VI-0521, topiramate, phentermine
Drug
Lead sponsor
VIVUS LLC
Industry
Eligibility
18 Years to 70 Years
Enrollment
756 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2007 – 2008
U.S. locations
2
States / cities
Durham, North Carolina • Philadelphia, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Mar 29, 2015 · Synced Sep 1, 2026, 10:28 PM EDT
Completed Phase 2 Interventional Results available

Study of VI-0521 Compared to Placebo in the Glycemic Management of Obese Diabetics

NCT00486291
View directory record Official record
Conditions
Type 2 Diabetes Mellitus
Interventions
VI-0521, Placebo
Drug
Lead sponsor
VIVUS LLC
Industry
Eligibility
18 Years to 65 Years
Enrollment
210 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2007 – 2008
U.S. locations
9
States / cities
Birmingham, Alabama • Los Angeles, California • San Francisco, California + 6 more
Source: ClinicalTrials.gov public record
Updated Sep 9, 2012 · Synced Sep 1, 2026, 10:28 PM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

Pharmacokinetic Comparison of Multiple Formulations of Topiramate and Phentermine in Obese Adults

NCT00518466
View directory record Official record
Conditions
Obesity
Interventions
topiramate, phentermine
Drug
Lead sponsor
VIVUS LLC
Industry
Eligibility
19 Years to 65 Years
Enrollment
64 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2007
U.S. locations
1
States / cities
Mountain View, California
Source: ClinicalTrials.gov public record
Updated Jun 7, 2011 · Synced Sep 1, 2026, 10:28 PM EDT
Active, not recruiting No phase listed Observational

Weight Loss Management in Endometrial Cancer Survivors

NCT06877572
View directory record Official record
Conditions
Endometrial Cancer Survivors, Weight Management, Early Stage Endometrial Cancer
Interventions
Weight loss with pharmacotherapy, Weight loss without pharmacotherapy
Behavioral
Lead sponsor
University of Kansas Medical Center
Other
Eligibility
18 Years and older · Female only
Enrollment
50 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2025 – 2030
U.S. locations
1
States / cities
Kansas City, Kansas
Source: ClinicalTrials.gov public record
Updated Aug 11, 2026 · Synced Sep 1, 2026, 10:28 PM EDT
Recruiting Phase 2 Interventional

Efficacy and Safety of Phentermine/Topiramate in Youth With Hypothalamic Obesity

NCT06299891
View directory record Official record
Conditions
Hypothalamic Obesity, Hypothalamic Tumor, Craniopharyngioma
Interventions
Phentermine / Topiramate Extended Release Oral Capsule [Qsymia], Placebo
Drug · Other
Lead sponsor
Seattle Children's Hospital
Other
Eligibility
6 Years to 28 Years
Enrollment
24 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2025 – 2026
U.S. locations
2
States / cities
Philadelphia, Pennsylvania • Seattle, Washington
Source: ClinicalTrials.gov public record
Updated Jul 27, 2025 · Synced Sep 1, 2026, 10:28 PM EDT
Completed Not applicable Interventional

Preventing Diabetes

NCT05395377
View directory record Official record
Conditions
PreDiabetes
Interventions
Registered Dietitian/Nutritionist, Diabetes Prevention Program, Weight Watchers, Reimagined, DPP or RDN Counseling + Medication, Bariatric Surgery Evaluation
Behavioral · Other
Lead sponsor
Geisinger Clinic
Other
Eligibility
18 Years to 89 Years
Enrollment
84 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017 – 2021
U.S. locations
1
States / cities
Danville, Pennsylvania
Source: ClinicalTrials.gov public record
Updated May 26, 2022 · Synced Sep 1, 2026, 10:28 PM EDT
Not yet recruiting Phase 2 Interventional

Obesity Treatment Using Phentermine-Topiramate ER to Improve Metabolic Health in Adolescents Surviving Leukemia and Lymphoma

NCT07790913
View directory record Official record
Conditions
Acute Lymphoblastic Leukemia in Remission, Hodgkin Lymphoma in Remission, Non-Hodgkin Lymphoma in Remission, Cancer Survivorship
Interventions
Phentermine/Topiramate ER, Health Behavior and Lifestyle Counseling
Drug · Behavioral
Lead sponsor
St. Jude Children's Research Hospital
Other
Eligibility
12 Years to 24 Years
Enrollment
45 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2026 – 2031
U.S. locations
1
States / cities
Memphis, Tennessee
Source: ClinicalTrials.gov public record
Updated Aug 26, 2026 · Synced Sep 1, 2026, 10:28 PM EDT
Completed Phase 3 Interventional Results available

Individualized Obesity Pharmacotherapy

NCT03374956
View directory record Official record
Conditions
Obesity
Interventions
Phentermine-Topiramate, Liraglutide, Naltrexone/bupropion, Phentermine
Drug
Lead sponsor
Mayo Clinic
Other
Eligibility
18 Years to 75 Years
Enrollment
193 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017 – 2022
U.S. locations
1
States / cities
Rochester, Minnesota
Source: ClinicalTrials.gov public record
Updated Jul 17, 2023 · Synced Sep 1, 2026, 10:28 PM EDT
Recruiting Not applicable Interventional Accepts healthy volunteers

Preoperative Weight Loss for Open Abdominal Wall Reconstruction

NCT05925959
View directory record Official record
Conditions
Abdominal Wall Hernia
Interventions
Preoperative Weight Management Program
Other
Lead sponsor
Benjamin T. Miller
Other
Eligibility
18 Years and older
Enrollment
258 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2023 – 2027
U.S. locations
2
States / cities
Chicago, Illinois • Cleveland, Ohio
Source: ClinicalTrials.gov public record
Updated Mar 22, 2026 · Synced Sep 1, 2026, 10:28 PM EDT
Completed Phase 1 Interventional

FDA Approved Medication to Reduce Binge Eating and/or Purging

NCT02553824
View directory record Official record
Conditions
Binge Eating Disorder, Bulimia Nervosa
Interventions
Phentermine/Topiramate-First, Placebo
Drug
Lead sponsor
Stanford University
Other
Eligibility
18 Years to 60 Years
Enrollment
22 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2015 – 2017
U.S. locations
1
States / cities
Stanford, California
Source: ClinicalTrials.gov public record
Updated May 13, 2018 · Synced Sep 1, 2026, 10:28 PM EDT