Clinical trials
Constipation - Functional clinical trials
Below are recruiting constipation - functional clinical trials, each written for real people, not researchers. We’re tracking 155 recruiting studies, each written for real people, not researchers, below.
Recruiting studies
- NCT05577845Recruiting
Ramosetron vs loperamide for bowel symptoms after rectal surgery
This trial compares two medicines—ramosetron and loperamide—to see which works better for severe bowel control problems after low anterior rectal surgery. It may help people with major LARS (low anterior resection syndrome) choose a safer, more effective treatment.
Seoul, Jongro-guAges 19 years+ - NCT05502913RecruitingPhase 2
Fecal transplant plus cancer immunotherapy for lung cancer
This trial studies whether giving a fecal microbiota transplant (a stool-based sample from a carefully screened donor) alongside immune checkpoint inhibitors can improve outcomes in people with lung cancer. It aims to change the gut bacteria to help the immune system work better against the cancer.
BeershebaAges 18 years+ - NCT06198309Recruiting
Predicting worsening COPD in severe patients
This study builds a tool to predict which COPD patients are likely to have worsening symptoms. It may help your doctor better manage your care if you have severe COPD.
Beijing, Beijing MunicipalityAges 40–85 - NCT06222255Recruiting
Transanal irrigation for sleep issues after rectal cancer surgery
This trial tests if a special irrigation technique can improve sleep problems caused by low anterior resection syndrome (LARS) after rectal cancer surgery. It may help people who have ongoing bowel symptoms that disrupt sleep.
Seoul, Jongro-guAges 19–80 - NCT06220617Recruiting
Early detection of colorectal cancer using blood tests
This study is looking for people newly diagnosed with colorectal cancer or advanced adenoma to help find better ways to detect the disease early using advanced lab tests on blood samples.
Hangzhou, ZhejiangAges 18 years+ - NCT07837297Recruiting
How different fibers affect your gut
This study tests how different dietary fibers affect gas and fermentation in your gut. You'll eat special fiber meals and track your symptoms to help researchers understand how fiber impacts digestion.
Bath, SomersetAges 18–85 - NCT07821060Enrolling by invitation
Diet and meal timing for attention deficit hyperactivity disorder
This study looks at whether changing when you eat and improving your gut health (microbiome) can help manage attention deficit hyperactivity disorder (ADHD). It compares different diet and eating schedules to see if they improve ADHD symptoms.
Paterna, ValenciaAges 18–65 - NCT07816809Recruiting
Phage therapy for gut discomfort
This trial tests whether taking special capsules with friendly viruses (phages) can help reduce stomach pain, bloating, constipation, or diarrhea by balancing the bacteria in your gut.
Fort Collins, ColoradoAges 18–75 - NCT06205862RecruitingPhase 2
Fecal transplant for preventing colon polyp return
This study tests whether taking capsules of healthy bacteria (fecal microbiota transplant) can help prevent colon polyps from coming back after they have been removed. It might be an option for people who have had an adenoma polyp removed and want to reduce the chance of recurrence.
Guangzhou, GuangdongAges 18–75 - NCT07786116Recruiting
Gut bacteria in Parkinson's disease and related conditions
This study looks at how certain gut bacteria (methanogens) are involved in the progression of Parkinson's disease and related conditions. It aims to understand the connection between gut health and brain health, which may lead to better treatments.
Cambridge, CB2Ages 55 years+ - NCT07782593Recruiting
Snack bars for appetite and gut health in UK adults
This study is testing how certain snack bars affect appetite, fullness, and gut health in adults. Participants will eat the snack bars regularly for a period and have their responses measured. To join, you need to live in the UK, snack regularly, and have a low fiber diet.
LondonAges 35–65 - NCT07776418Recruiting
How different snacks affect appetite after eating
This study tests how different snack bars affect your hunger, fullness, and digestion in the hours after eating. You may be eligible if you eat snacks regularly and are interested in how your body responds to food.
LondonAges 35–65 - NCT07760467RecruitingPhase 1
Study of an oral medication for safety in healthy adults
This study tests an investigational oral medication called TUL321 in healthy volunteers to see if it is safe and how the body handles it. It may help understand the drug's effects and is an early step in developing a new treatment.
Changsha, HunanAges 18–45 - NCT07749768RecruitingPhase 1
Oral drug for ulcerative colitis safety study
This study tests an investigational oral drug for ulcerative colitis. It is an early-stage trial to check safety and how the drug is processed by the body in both healthy volunteers and patients with active ulcerative colitis.
Miami, FloridaAges 18–55 - NCT06474507Recruiting
Calculus Bovis Sativus for Stroke Recovery
This study tests an investigational traditional Chinese medicine called Calculus Bovis Sativus (CBS) for people who have had an ischemic stroke or have small vessel disease in the brain. It aims to see if CBS can help recovery and is safe to use.
Wuhan, HubeiAges 18 years+ - NCT06605898Recruiting
Metabolic and lifestyle study for adults 45-64
This study tests a personalized diet and lifestyle program to improve metabolic health. It may help if you are between 45 and 64, do not smoke, and have no major digestive or liver conditions.
Urbana, IllinoisAges 45–64 - NCT06474520Recruiting
Bovine gallstone extract for inflammatory brain disease
This trial tests a natural substance called Calculus Bovis Sativus (CBS) to see if it helps people with certain inflammatory brain conditions like multiple sclerosis, neuromyelitis optica, MOGAD, or ADEM. The goal is to find out if it is safe and effective.
Wuhan, HubeiAges 18 years+ - NCT07749092Recruiting
Kimchi powder for gut health in IBS
This study tests whether taking kimchi powder (a dried form of the fermented cabbage dish) can improve gut health and symptoms in people with diarrhea-predominant IBS. You'll avoid regular kimchi for about 2 months, then take the powder daily and track how you feel.
YangsanAges 20–70 - NCT07732894Recruiting
Exercise and Guided Imagery for Bowel Symptoms After Cancer Surgery
This study tests if combining gentle aerobic exercise with guided imagery (a relaxation technique using your imagination) can help improve bowel control and reduce symptoms after rectal cancer surgery.
IstanbulAges 18–65 - NCT07736144Recruiting
Herbal formula study for fibromyalgia pain relief
This study tests a Chinese herbal formula called Yangyin Roujin (which nourishes yin and softens the muscles) to see if it helps reduce pain and other symptoms of fibromyalgia. If you have fibromyalgia and a pain level of 4 or more, you may be able to join.
Beijing, Beijing MunicipalityAges 18–75 - NCT07722585RecruitingPhase 1
New tablet study: absorption and food effects
This study tests a new form of the drug nurandociguat tablet to see how well it is absorbed compared to the old tablet, and whether food changes how it works. Healthy volunteers are needed to take the tablets and have their blood levels checked.
BerlinAges 18–58 - NCT07713810Recruiting
Can supplements help with constipation? A study on health products
This study tests if certain health and wellness products can improve constipation and related health issues. It compares the active product to a placebo (a dummy product without active ingredients) to see if it really works.
Del Mar, CaliforniaAges 21–105 - NCT07682077Recruiting
Kefir drink to prevent diabetes in pregnancy
This study tests whether a daily probiotic drink (kefir) during pregnancy can help prevent gestational diabetes. It's for pregnant people who are less than 14 weeks along and live near Fredericton, New Brunswick.
Fredericton, New BrunswickAges 19 years+ - NCT05785585Recruiting
B12 supplements test for people on a vegetarian diet
This study compares two forms of vitamin B12 to see how well they improve or maintain B12 levels in adults who eat vegetarian. It may help people understand which type of B12 works best for supporting normal B12 status.
Reus, TarragonaAges 18 years+
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Common questions
- Are there clinical trials for constipation - functional?
- Yes. Clin2 currently lists 155 recruiting constipation - functional 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 constipation - functional 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 constipation - functional 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.