Fecal Microbiota Transplant

What this procedure is

Fecal microbiota transplant (FMT) is a procedure that transfers healthy bacteria from a screened donor into the digestive tract of another person. The goal is to restore a healthy balance of "good" bacteria in the gut. These tiny organisms, known as the microbiota, are essential for digestion and a strong immune system.

During the procedure, your clinician may deliver the donor material in a few different ways. Common methods include:

• Colonoscopy: A thin, flexible tube is used to place the material directly into the colon while you are sedated.
• Endoscopy: A tube is passed through the mouth or nose into the stomach or small intestine.
• Capsules: In some cases, the material is prepared into specialized pills that are swallowed.

What it treats or fixes

The main reason clinicians use FMT is to treat a bacterial infection called Clostridioides difficile, or C. diff. This infection can cause severe diarrhea and stomach pain. While antibiotics usually treat infections, C. diff can sometimes keep coming back because the gut's natural defenses have been weakened by previous treatments.

FMT helps by "re-populating" the gut with healthy bacteria. These new bacteria help crowd out the C. diff and prevent it from returning. While researchers are studying FMT for other conditions like inflammatory bowel disease (IBD), it is currently most common and successful for recurring C. diff infections.

How common it is & where it's done

FMT has become a standard and effective option for patients who have C. diff infections that do not respond to traditional medicine. It is typically performed in a hospital or a specialized digestive health clinic by a gastroenterologist, which is a doctor who focuses on the digestive system.

The process is carefully managed to ensure safety. Donors are thoroughly screened for infections and other health conditions before their material is used. Your clinician will help determine if this procedure is the right step for your specific health needs and will perform the procedure in a controlled, professional medical setting.

Recovery: What to Expect

Most patients can go home shortly after the procedure. You may feel some mild bloating, gas, or stomach cramping for a day or two. Your clinician may suggest resting for the remainder of the day before returning to your usual routine.

You can typically resume your normal diet right away unless your care team gives you specific instructions. It is helpful to drink plenty of fluids as your body adjusts to the new bacteria.

Risks & Possible Complications

FMT is generally considered a safe procedure. The most common side effects are temporary and include:

• Mild stomach pain or cramping
• Bloating or gas
• Short-term diarrhea or constipation

While rare, there is a small risk of picking up an infection from the donor material. To prevent this, clinicians use very strict screening processes to ensure the donor is healthy and the sample is safe. You should contact your clinician if you experience a high fever or severe pain that does not go away after the first day.

Outcomes & Long-Term Results

For many people, especially those dealing with repeat C. diff (a type of harmful bacteria) infections, the results can be very positive. Many patients start to feel better within just a few days of the transplant.

The goal of the procedure is to restore a healthy balance of "good" bacteria in your gut. While many see long-term relief, your clinician will monitor your progress to ensure the new bacteria stay balanced and healthy. Success rates are often high for treating specific infections that have not responded to other treatments.

Emotional Support & Reassurance

It is natural to feel a bit nervous or uncertain about this procedure because it is unique. Remember that FMT is a science-based way to help your body heal itself by rebuilding your microbiome (the community of helpful germs in your digestive tract).

Your healthcare team is there to support you. Don't hesitate to ask questions about the donor screening process or what to expect during your recovery. Taking this step is a proactive way to regain your health and return to your daily life with more comfort.

Why doctors recommend it

Doctors usually recommend a fecal microbiota transplant (FMT) when a patient has a Clostridioides difficile (or C. diff) infection that keeps coming back. C. diff is a type of bacteria that can cause severe diarrhea and inflammation in the colon, which is the large intestine.

While antibiotics are often the first choice to treat this infection, they can sometimes kill the "good" bacteria that keep your gut healthy. Without enough good bacteria, the C. diff germs may grow back. Your clinician may suggest FMT to help restore the natural balance of your gut by introducing healthy bacteria from a donor.

Urgent vs planned treatment

In most cases, FMT is a planned procedure. Your clinician may schedule it after you have finished a round of antibiotics but continue to have symptoms. This gives the medical team time to ensure the donor material is properly screened and that you are ready for the transplant.

In some situations, the treatment may be more urgent. If a C. diff infection becomes very severe and does not respond to standard medicine, a doctor might recommend FMT more quickly. This is done to help stop the infection before it causes more serious health problems. Your care team will decide on the timing based on your specific symptoms and medical history.

Goals of treatment

The primary goal of FMT is to break the cycle of recurring infections. By "re-seeding" the gut with healthy microbes—tiny living organisms like bacteria—the procedure aims to prevent C. diff from taking over the digestive tract again.

Success in this treatment typically means:

• A significant reduction or total end to symptoms like diarrhea and stomach cramping.
• A more stable and diverse microbiome (the community of germs living in your gut).
• A lower chance of needing long-term or repeated antibiotic use for the same infection.

Most patients begin to feel better within a few days of the procedure. The ultimate goal is to help your digestive system return to a healthy state so you can return to your normal routine.

Who may benefit

Fecal microbiota transplant (FMT) is most often used for people dealing with a Clostridioides difficile (C. diff) infection. C. diff is a type of bacteria that can cause severe diarrhea and inflammation in the colon. While many people recover using standard antibiotics, some find that the infection keeps coming back or does not respond to regular medicine.

Your clinician may suggest FMT if you have had multiple C. diff infections or if your symptoms are very severe. The goal is to replace "bad" bacteria with "good" bacteria from a healthy donor. This helps restore a healthy balance in your gut, which is often called your microbiome.

Researchers are also studying how FMT might help people with other digestive issues, such as ulcerative colitis. However, it is currently most common and successful for treating repeat C. diff infections.

When it may not be the right option

FMT is generally considered safe, but it is not the right choice for everyone. Your care team will look at your overall health history before deciding. For example, if you have a severely weakened immune system, the risk of developing a new infection from the donor material might be too high.

It may also not be recommended if you have certain severe underlying health conditions or if you are currently responding well to other treatments. Because FMT involves introducing foreign bacteria into your body, your clinician will carefully weigh the benefits against any potential risks for your specific situation. It is usually not the first treatment tried for most conditions.

Questions to ask your care team

Deciding on a medical procedure is a big step. It is helpful to bring a list of questions to your appointment to make sure you feel comfortable with the plan. You might consider asking your care team:

• How do you screen the donors to make sure the sample is safe?
• Which method will be used to deliver the transplant (such as a colonoscopy or a swallowed capsule)?
• What are the most common side effects I should watch for after the procedure?
• How soon can I expect to see an improvement in my symptoms?
• Are there any specific foods or medicines I should avoid before or after the transplant?

In the procedure room

When you arrive for the procedure, you will be taken to a private medical room. The care team will help you get comfortable on a procedure table. You will typically be asked to lie on your left side with your knees bent toward your chest. This position helps the clinician guide the instruments more easily through the natural curves of your digestive tract.

The room will contain monitoring equipment and a screen where the clinician can see images from a small camera. A nurse or technician will stay with you throughout the process to ensure you are comfortable and relaxed.

High-level steps

The clinician will use a thin, flexible tube called a colonoscope or an endoscope to perform the transplant. This tube is gently guided into the colon or the stomach. Once the tube is in the correct position, the clinician carefully releases the donor material, which contains healthy bacteria, into your system.

The goal of this step is to "seed" your gut with a healthy balance of microbes. These new, helpful bacteria are intended to grow and help your body fight off harmful germs that may be causing illness. Once the material is placed, the clinician slowly removes the tube.

Anesthesia and pain control

To make the experience as easy as possible, your clinician may give you sedation. This is medicine delivered through a small tube in your arm that makes you feel very relaxed, drowsy, or even asleep. Because of this medicine, most people do not feel any pain during the procedure.

You might notice a sensation of pressure, mild cramping, or a feeling of fullness in your abdomen. These feelings are normal and usually pass quickly. The medical team will adjust your care to make sure you stay comfortable the entire time.

Monitoring and safety steps

Your safety is the top priority during the procedure. The medical team uses sensors to monitor your heart rate, blood pressure, and oxygen levels. This constant check ensures your body is responding well to the sedation and the procedure itself.

The clinician also uses a tiny camera on the end of the tube to see the inside of your digestive tract clearly. This allows them to check for any irritation and ensures the healthy bacteria are placed in the best possible spot for your recovery.

Immediately after the procedure

After the procedure is finished, you will be moved to a quiet recovery area. You may feel some bloating or the need to pass gas. This happens because clinicians often use a small amount of air to expand the area so they can see more clearly. Passing this gas is a normal part of recovery and will help you feel better quickly.

A nurse will watch over you as the sedation wears off. You will stay in the recovery area until you are fully awake and alert. Your clinician will then discuss the next steps for your care before you are ready to go home with a companion.

Typical procedure length

The actual transplant procedure usually takes between 30 and 60 minutes. However, you should plan to be at the medical facility for a few hours in total. This extra time allows for the initial preparation, the time needed for the sedation to take effect, and the recovery period afterward.

Common approaches (open vs minimally invasive)

Fecal Microbiota Transplant (FMT) is not a form of open surgery. Instead, clinicians use minimally invasive methods to place healthy stool (bacteria) into your digestive tract. The goal is to deliver the material to the colon where it can help fight infection.

Your doctor will recommend a method based on your health, your ability to swallow, and where the treatment needs to go. Common delivery methods include:

• Colonoscopy: This is a common approach. While you are sedated (asleep), a flexible tube is guided into the colon to deliver the transplant. This allows the doctor to see the inside of the colon at the same time.
• Upper Endoscopy or Nasogastric Tube: A thin tube is passed through the nose or mouth, down the throat, and into the stomach or small intestine. This may be chosen if a colonoscopy is not safe for you.
• Capsules (Pills): In some cases, you may be able to swallow specially prepared capsules containing the donor material. This is the least invasive option but is not available at all centers.
• Enema: The material is introduced directly into the rectum. This is less invasive than a colonoscopy but may not reach as far into the colon.

Partial vs total

Note: The terms "partial" and "total" are often used for surgery, but in FMT, they refer to how much of the colon is treated.

Different methods reach different parts of your bowel. Approaches like swallowing capsules or using a colonoscopy generally allow the healthy bacteria to reach the entire length of the colon (total coverage). This is often preferred to ensure the healthy bacteria can populate the whole area.

In contrast, an enema generally reaches only the lower part of the colon (partial coverage). Your clinician may choose this approach if the infection is located lower down or if a full colonoscopy is too risky for your current health condition.

Revision or repeat procedures

FMT has a high success rate for treating certain infections, such as recurrent C. difficile (C. diff). However, the procedure does not work for everyone after a single attempt. If your symptoms do not improve, or if the infection returns, your doctor may suggest a repeat procedure.

A second transplant may involve:

• Using a different donor source.
• Trying a different delivery method (for example, switching from capsules to colonoscopy).
• Combining FMT with a specific course of antibiotics beforehand.

Your care team will monitor you closely after the first procedure to decide if a revision is necessary.

Tests and imaging that may be done

Before the procedure, your healthcare team will review your medical history to ensure you are a good candidate for a fecal microbiota transplant (FMT). You will likely undergo blood tests to check for specific infections, such as HIV, syphilis, or hepatitis. These safety checks help your care team manage your overall health during the process.

Your clinician may also test a sample of your stool. This confirms the presence of C. difficile or checks for other parasites and bacteria. If your transplant will be delivered via a colonoscopy, your doctor may review past imaging or order new scans to ensure your colon is safe to examine.

Medication adjustments

Your doctor will provide a specific schedule for your medications. It is important to follow these directions so the new bacteria can survive and settle in your system.

• Antibiotics: You are typically asked to stop taking any antibiotics 24 to 48 hours before the procedure. If you continue taking them, the medication might kill the healthy donor bacteria.
• Blood thinners and NSAIDs: If your transplant is being done through a colonoscopy, you may need to pause blood thinners, aspirin, or ibuprofen for a short time to reduce the risk of bleeding.
• Acid reducers: If you are swallowing capsules for the transplant, you might be asked to stop acid-reducing medicines beforehand.

Note: Do not stop taking any prescribed medication unless your clinician specifically instructs you to do so.

Day-before and day-of instructions

Preparing your body—specifically your colon—is the most important part of the process. If the colon is not empty, the procedure may need to be rescheduled. Most patients follow a preparation routine very similar to a standard colonoscopy.

The day before:

• Diet: You will likely follow a clear liquid diet. This includes broth, water, tea, and clear juices (usually avoiding red or purple colors).
• Bowel prep: You will take a strong laxative drink prescribed by your doctor. This flushes out your colon to make it clean for the transplant.

The day of the transplant:

• Fasting: You generally must stop eating and drinking several hours before your appointment.
• Medication: Your clinician may give you an anti-diarrheal medicine (like loperamide) just before the procedure starts. This slows down your digestion and helps the transplant stay in your body longer.
• Logistics: Wear loose, comfortable clothing. If you are receiving sedation for a colonoscopy, you must arrange for a friend or family member to drive you home.

General surgical risks

Because Fecal Microbiota Transplant (FMT) is often delivered through a colonoscopy or endoscopy, the general risks are similar to those standard medical exams. These procedures are common, and serious problems are rare.

Risks related to the method of delivery and sedation may include:

• Reactions to medicine: You may have a reaction to the sedative used to help you relax or sleep. This can sometimes cause nausea, vomiting, or temporary breathing changes.
• Bleeding: There is a small risk of minor bleeding, especially if your doctor takes a tissue sample (biopsy) during the procedure.

Procedure-specific complications

Most side effects related to the transplant itself are mild and temporary. These symptoms usually happen as your digestive system adjusts to the new healthy bacteria.

Common side effects may include:

• Bloating and gas
• Stomach cramps or pain
• Diarrhea or constipation
• Nausea

Serious complications are rare. There is a very small risk that an infection could be passed from the donor stool to you. To prevent this, donors go through strict health screenings and blood tests. If the procedure is done via colonoscopy, there is also a rare risk of a small tear (perforation) in the wall of the colon.

How complications are treated

Your clinical team will monitor you after the procedure to make sure you are recovering safely. Most issues are treatable or go away on their own.

• Digestive discomfort: Symptoms like gas, bloating, or cramps typically resolve without treatment within a few days.
• Infection: In the unlikely event of an infection, your doctor may prescribe antibiotics or other medications to treat it.
• Physical injury: While very rare, a tear in the colon or significant bleeding might require surgery to repair.

Your doctor will tell you what warning signs to watch for, such as fever or severe belly pain, so any problems can be treated right away.

Pain control medicines

Most people do not feel much pain during a fecal microbiota transplant (FMT). If your procedure is done through a colonoscopy, your clinician may give you medicine to help you relax or sleep. This is called sedation. Afterward, you might feel some mild cramping or bloating.

If you need relief for minor discomfort, your clinician may suggest over-the-counter options like acetaminophen. It is important to tell your care team about any allergies you have to pain medications. They will tailor a plan that is safe for your specific health needs.

Antibiotics

Antibiotics are medicines used to kill harmful bacteria. However, they can also kill the healthy bacteria being introduced during an FMT. Because of this, your clinician will likely ask you to stop taking certain antibiotics a few days before your procedure.

Commonly, patients stop these medicines about 24 to 72 hours before the transplant. This gives the new, healthy bacteria a better chance to grow and balance your system. Your doctor will provide a specific schedule for when to stop and if you should restart any medications later.

Blood thinners and clot prevention

Blood thinners, also known as anticoagulants, are medicines that help prevent blood clots. If your FMT is performed using a colonoscopy or another internal scope, your clinician may need to adjust these medications. This is done to reduce the risk of bleeding during the procedure.

Your care team will review your history of heart health or stroke risk before making any changes. Never stop taking a blood thinner without a direct instruction from your healthcare provider. They will coordinate with you to ensure the process is handled safely.

Emergency warning signs

Fecal microbiota transplant (FMT) is generally safe, but serious complications can happen in rare cases. If your procedure was performed using a colonoscopy or endoscopy, there is a very small risk of injury to the colon wall. You should seek immediate medical help or go to the emergency room if you experience:

• Severe belly pain that gets worse or makes your abdomen feel hard and rigid.
• A high fever (usually over 101°F or 38.3°C) with shaking chills.
• Large amounts of blood in your stool or black, tarry bowel movements.
• Difficulty breathing, chest pain, or severe dizziness.

Call your surgeon or clinic if…

Most people recover quickly, but it is important to stay in touch with your healthcare team if you notice changes that do not seem right. Contact your clinician if you have:

• Diarrhea that returns or becomes severe after initially getting better.
• Nausea or vomiting that prevents you from drinking fluids.
• Signs of dehydration, such as dry mouth, extreme thirst, or very dark urine.
• A low-grade fever that lasts more than 24 hours.
• New or worsening abdominal swelling that is uncomfortable.

Expected vs concerning symptoms

Your digestive system may need a few days to adjust to the new bacteria. Knowing the difference between normal side effects and signs of a problem can help you stay calm.

Expected symptoms (usually mild and temporary):

• Gas, bloating, or belching.
• Mild stomach cramps.
• Irregular bowel movements, such as temporary constipation or loose stools.
• A small amount of spotting on toilet paper (if a colonoscopy was used).

Concerning symptoms (require medical attention):

• Pain that is severe or does not go away with rest.
• Fever or chills that develop days after the procedure.
• Symptoms of your original infection (such as C. diff) coming back.
• Persistent vomiting.

Non-surgical treatments

Before recommending a fecal microbiota transplant (FMT), your clinician will usually try standard medical treatments. The most common approach involves using specific antibiotics, such as vancomycin or fidaxomicin. These medicines are designed to target and kill the C. diff bacteria that cause the infection.

Other non-surgical options your care team might consider include:

• Repeat antibiotic cycles: Trying a different dose or a longer course of medicine to ensure the bacteria are fully cleared.
• Specialized medications: Using newer drugs that are specifically designed to help prevent the infection from coming back after the initial treatment.
• Probiotics: While not a primary treatment, some clinicians may discuss using beneficial bacteria supplements to help support your digestive system during recovery.

Watchful waiting

Watchful waiting is a period where your care team monitors your health closely without starting a new procedure or medication. This approach is sometimes used if your symptoms are mild or if you have just finished a round of antibiotics. It allows your clinician to see if your natural gut bacteria can recover and balance themselves on their own.

During this time, you may be asked to track your symptoms, such as how often you go to the bathroom or any discomfort you feel. If your symptoms stay the same or improve, you might not need further intervention. However, if your symptoms begin to return or get worse, your clinician may decide it is time to move forward with FMT.

When surgery becomes the best option

In many cases, FMT is used to avoid the need for surgery. However, there are times when surgical intervention is the safest and most effective choice for your health. This usually happens if the infection becomes life-threatening or causes severe physical damage to the colon that cannot be fixed with medicine or a transplant.

Your clinician may suggest surgery if you experience the following:

• Severe inflammation: If the colon becomes dangerously swollen and does not respond to antibiotics or FMT.
• Perforation: If a hole develops in the wall of the intestine, which requires immediate repair.
• Critical illness: If the infection causes the body to go into shock or leads to organ failure.

While surgery is a significant step, it can be a life-saving measure when the digestive tract is too damaged to heal through other means. Your medical team will weigh the risks and benefits to ensure you receive the most appropriate care for your specific situation.

Hospital services that commonly perform this surgery

Fecal microbiota transplant (FMT) is most often performed within a hospital's Gastroenterology department. This department specializes in the digestive system, including the stomach and intestines. Because FMT is frequently used to treat specific infections, you may also work with the Infectious Disease team to coordinate your care.

Many large medical centers have dedicated Digestive Health Centers. These centers bring together different specialists to manage the procedure. While it is often referred to as a surgery in hospital listings, it is usually a non-surgical procedure performed in an endoscopy suite or a specialized clinic room.

Patient resources and support services

Hospitals often provide patient navigators or coordinators who guide you through the process. These professionals help schedule your appointments and explain how to prepare for the procedure. They can also provide educational materials that explain the benefits and risks in simple terms.

Support services may also include:

• Financial Counseling: Specialists who help you understand insurance coverage and the costs of donor material.
• Support Groups: Groups for people with chronic digestive issues or recurring infections, where you can talk with others who have had similar treatments.
• Clinical Trial Offices: If you are seeking FMT for conditions like Ulcerative Colitis, these offices provide information on the latest research and how to participate in studies.

Questions for choosing where to have surgery

Choosing the right facility is an important step in your recovery. Your clinician may suggest a specific center, but you can also research options on your own. Here is a short checklist of questions to ask a potential hospital:

• How much experience does the gastroenterology team have with FMT procedures?
• What safety steps and screening tests do you use for the donor material?
• Which delivery method—such as a colonoscopy, an endoscopy, or oral capsules—is best for my situation?
• Is the procedure performed on an outpatient basis, or will I need to stay in the hospital?
• What does the follow-up care look like, and who do I contact if I have questions after the procedure?

Conditions commonly treated by this procedure

The most common reason a clinician may recommend a fecal microbiota transplant (FMT) is to treat a Clostridioides difficile (C. diff) infection. C. diff is a type of bacteria that can cause severe swelling and irritation in the colon. While many people recover with standard antibiotics, the infection can sometimes return. FMT is often considered when other treatments have not worked or if the infection keeps coming back.

Researchers are also looking into how FMT might help with other digestive issues. These may include types of Inflammatory Bowel Disease (IBD), such as:

• Ulcerative colitis: A condition that causes sores and inflammation in the lining of the large intestine.
• Crohn’s disease: A chronic condition that causes inflammation anywhere in the digestive tract.

While FMT is primarily used for C. diff, your healthcare provider can help determine if this procedure is appropriate for your specific health needs or if you might qualify for a clinical trial for other conditions.

Related symptoms people search for

People who are candidates for this procedure often experience symptoms related to an imbalance of gut bacteria. These symptoms can be uncomfortable and may interfere with daily life. Common signs that can be associated with these conditions include:

• Frequent, watery diarrhea that does not go away.
• Strong abdominal cramping or stomach pain.
• A general feeling of being unwell, which may include a fever.
• Loss of appetite or nausea.

It is important to remember that these symptoms can be caused by many different health issues. If you are experiencing persistent digestive changes, your clinician may perform tests to find the exact cause. They can help you understand if your symptoms are related to an infection like C. diff or another underlying digestive concern.

Evidence overview

Fecal microbiota transplant (FMT) is primarily recognized as a treatment for recurrent Clostridioides difficile (C. diff) infection. This is a bacterial infection that causes inflammation in the colon. Doctors typically recommend FMT only after standard antibiotics have failed to clear the infection or if the infection keeps returning.

Medical studies indicate that FMT is highly effective for treating difficult cases of C. diff. It helps restore a healthy balance of bacteria in the gut, which can stop the cycle of infection.

Researchers are also studying whether FMT can help with other conditions, such as ulcerative colitis or Crohn's disease. However, using FMT for these conditions is still considered experimental. Currently, it is usually only an option for these other digestive issues within clinical trials (research studies).

Safety notes and individualized care

To protect patients, potential donors undergo a rigorous screening process. This process is similar to screening for blood donation. Doctors test donor stool and blood to check for:

• Harmful bacteria and parasites
• Viruses (such as hepatitis or HIV)
• Other potential health risks

While FMT is generally considered safe when performed by a medical professional, there are risks involved. Common side effects are often mild and temporary. These may include bloating, gas, diarrhea, cramping, or a mild fever shortly after the procedure.

Serious complications are rare but can happen. These might include a severe infection or a reaction to the medicine used to make you sleep (sedation) during the procedure. Your clinician will review your specific medical history to determine if the benefits of the transplant outweigh the potential risks for you.