Clinical trials
Bariatric Surgery clinical trials
Below are recruiting bariatric surgery clinical trials, each written for real people, not researchers. We’re tracking 243 recruiting studies, each written for real people, not researchers, below.
Recruiting studies
- NCT03519906Recruiting
Bariatric surgery study measuring how metoprolol is absorbed
This study looks at how metoprolol (a blood-pressure medicine) gets absorbed in the body before and after bariatric weight-loss surgery. If you’re preparing for gastric bypass or sleeve surgery, this may help researchers understand dosing and medicine absorption changes after surgery.
TrondheimAges 18–70 - NCT03532477Recruiting
Venlafaxine medicine study around weight-loss stomach surgery
This study looks at how the antidepressant venlafaxine is absorbed in the body when people undergo gastric bypass or sleeve gastrectomy. It may help doctors understand whether dosing should change after surgery.
TrondheimAges 18–70 - NCT03535376Recruiting
Studies how valsartan works after bariatric surgery
This study looks at how the blood-pressure medicine valsartan is absorbed and processed in your body after gastric bypass or sleeve surgery. It may help doctors choose safer, more effective dosing after weight-loss surgery.
TrondheimAges 18–70 - NCT03538457Recruiting
Gastric bypass or sleeve surgery and paracetamol absorption
This study looks at how your body absorbs paracetamol (acetaminophen) after planned weight-loss surgery. It may help doctors better guide pain- and fever-medication dosing after gastric bypass or sleeve gastrectomy.
TrondheimAges 18–70 - NCT03842475Recruiting
Who may benefit from weight-loss surgery for diabetes?
This study looks at which people with type 2 diabetes (or prediabetes) are most likely to benefit from bariatric surgery. It compares people who are planning surgery with healthy volunteers to better understand how body changes relate to blood sugar.
London, Greater LondonAges 18–80 - NCT06783751Recruiting
New surgical method to reduce acid reflux after weight loss surgery
This trial tests a modified version of sleeve gastrectomy that aims to reduce the risk of acid reflux (GERD) after surgery. It is for people aged 18–65 with a BMI between 35 and 55 who already have some degree of GERD and are planning to have weight loss surgery.
Orange, CaliforniaAges 18–65 - NCT04141592Recruiting
Study immune and disease changes in fatty liver
This study looks at what drives non-alcoholic fatty liver disease and how it affects the body, including immune-related changes. You may be invited if you have confirmed fatty liver disease or, alternatively, if you are a healthy person with no liver disease.
London, Greater LondonAges 18 years+ - NCT04232566Recruiting
Study links in obesity surgery and liver scarring
This study looks at how the immune system relates to liver scarring in people with obesity who are getting gastric bypass surgery. If you qualify, you may help doctors better understand liver disease and who is at higher risk.
Scottsdale, ArizonaAges 30–70 - NCT04411823Recruiting
Predicting reflux after stomach sleeve surgery
This trial looks at how to predict who will develop acid reflux after a “stomach sleeve” operation. It may help doctors choose the safest plan before surgery and better prevent reflux afterward.
Orlando, FloridaAges 18 years+ - NCT04526743Recruiting
Eating habits and weight changes after weight-loss surgery
This study looks at how eating behaviors change over time after bariatric (weight-loss) surgery. It may help researchers understand why some people lose more weight than others and how to improve support after surgery.
BarcelonaAges 18–70 - NCT04852198Recruiting
Compare two weight-loss surgeries in people with high BMI
This study compares two types of bariatric surgery to see which one works as well as the other for weight loss and health. You may be a candidate if you have a high BMI and specific related health problems, and if certain stomach and digestive issues don’t apply to you.
Almere StadAges 18–65 - NCT04893954Recruiting
Study of spine changes after weight loss from bariatric surgery
This study looks at how rapid weight loss after bariatric surgery may affect your spine over the following year or more. It may help doctors better predict who gets spine-related problems or improvements after surgery.
ParisAges 18 years+ - NCT04922333RecruitingPhase 3
Bisphosphonate to prevent bone loss after sleeve weight-loss surgery
This study looks at whether a bisphosphonate medicine can reduce bone loss after sleeve gastrectomy (a type of weight-loss surgery). If you had the surgery, it may help protect your bones while you recover and lose weight.
Winston-Salem, North CarolinaAges 30 years+ - NCT05120492Recruiting
Program for severe knee arthritis and extreme weight
This feasibility study tests a practical approach to help people with very severe knee arthritis and very high body weight. It aims to find an effective and safe way to manage both conditions together in real-world care.
Halifax, Nova ScotiaAges 18–65 - NCT05211375RecruitingPhase 3
Compare two weight-loss surgeries for type 2 diabetes control
This Phase 3 trial compares sleeve gastrectomy versus a different bypass-style operation to improve blood sugar in adults with type 2 diabetes. It may help some people lower blood sugar and diabetes medication needs, but you must meet specific safety and health criteria.
Seongnam-siAges 18 years+ - NCT05330910Recruiting
Repair of a stomach valve during sleeve weight-loss surgery
This trial tests whether doing a specific repair near the stomach valve (the gastroesophageal junction) during laparoscopic sleeve gastrectomy can help people with a loose valve. It is aimed at adults who have a particular endoscopy finding (Hill grade III) and choose this weight-loss surgery.
SingaporeAges 21–65 - NCT05356000Recruiting
Testing how oxalate is absorbed to help prevent kidney stones
This study looks at how your body absorbs oxalate, a natural chemical that can contribute to calcium kidney stones. If you’ve had calcium stones—especially with high urine oxalate—it may help researchers find ways to reduce future stone risk.
Chicago, IllinoisAges 18–70 - NCT05404061Recruiting
Study for people who don’t lose weight after bariatric surgery
This study looks at people who have had bariatric surgery but still struggle to lose weight (or lose it poorly). It aims to better understand how to help “poor responders” and what might be interfering with weight-loss results.
LondonAges 18–70 - NCT05488288RecruitingPhase 3
Weight-loss surgery plus mesh repair for ventral hernia
This trial tests whether combining weight-loss surgery with a mesh repair for a midline ventral hernia works better and is safer than another approach. It may help people who have both severe obesity and a specific type of hernia reduce hernia problems after surgery.
ColombesAges 18–60 - NCT05602805Recruiting
Study using a health data bank for weight management
This study builds a data bank to help track how people manage overweight or obesity at the hospital. It may help improve care for future patients by learning what treatments and outcomes work best.
Québec, QuebecAges 18 years+ - NCT05650307Recruiting
Heart and metabolic scan study of weight and rehabilitation
This study uses detailed heart scans and information about metabolism (how your body uses energy) to understand how metabolic treatments and heart rehabilitation may affect your health. You may qualify either as someone undergoing bariatric (weight-loss) care or as part of a heart rehabilitation group—or as a healthy comparison group.
Cleveland, OhioAges 18 years+ - NCT05777928Recruiting
Tests satiety changes after bariatric surgery revision
This study looks at how feelings of fullness (satiety) change in people getting bariatric surgery—either a sleeve gastrectomy or a revision procedure. It may help improve how well weight-loss stays on track after surgery.
MilanAges 18–65 - NCT05816798RecruitingPhase 2/Phase 3
Laser treatment to reduce chronic knee pain before weight-surgery
This trial tests whether photobiomodulation (a type of laser/light therapy) can reduce chronic pain in both knees for people preparing for bariatric (weight-loss) surgery. If you have knee pain that limits daily life, the treatment may help you feel better while you’re in the pre-surgery rehabilitation period.
Goiânia, GoiásAges 18–70 - NCT05950698Recruiting
Study of obesity and bariatric surgery with mental and social factors
This study looks at how personal mental health and life circumstances relate to outcomes after bariatric (weight-loss) surgery. It may help the team understand what supports improve recovery and health after surgery.
Rio de Janeiro, Rio de Janeiro, BrazilAges 18–60
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Common questions
- Are there clinical trials for bariatric surgery?
- Yes. Clin2 currently lists 243 recruiting bariatric surgery studies from the U.S. registry, each rewritten for real people, not researchers, so you can see what it’s testing and who it’s for.
- How do I know if I qualify for a bariatric surgery trial?
- Each study lists its eligibility criteria — rules about age, diagnosis, and prior treatments. On every Clin2 trial page we explain these in words written for real people and offer a short, optional pre-screen for a fit read. The study team makes the final decision.
- Does it cost anything to join a bariatric surgery trial?
- Using Clin2 is always free. Many trials cover the cost of the study treatment and related visits; some reimburse travel. The study team explains exactly what’s covered before you decide.
Related conditions
Clin2 helps you find and understand clinical trials and does not provide medical advice. Study data comes from ClinicalTrials.gov. Talk with your doctor about whether a specific trial is right for you.