AI Summary Xifaxan (rifaximin) is typically added to lactulose to prevent recurrent hepatic encephalopathy by reducing ammonia-producing gut bacteria.
Medically reviewed.
Xifaxan (rifaximin) is an oral antibiotic that works mainly in the gut rather than throughout the body. It is used to reduce the risk of recurrent hepatic encephalopathy (HE), a complication of chronic liver disease that can affect brain function and cause confusion. Xifaxan lowers the ammonia-producing bacteria in the intestines and is typically added to lactulose for people who have had a recurrence of HE while on lactulose alone. It does not treat the underlying liver disease. Treatment decisions should always be individualized and guided by a healthcare professional.
This page covers Xifaxan's role in hepatic encephalopathy management — how it works, who may be eligible, benefits, side effects, and monitoring. You can also connect with a liver specialist near you for personalized guidance on whether Xifaxan fits your care plan.
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ABOUT XIFAXAN TREATMENT
Xifaxan is a prescription medicine whose active ingredient is rifaximin, an antibiotic that works mainly inside the gut rather than throughout the body. Xifaxan is used to reduce the risk of recurrent hepatic encephalopathy (HE), a complication of chronic liver disease that can affect brain function and cause confusion.
Unlike lactulose (Enulose, Kristalose, Generlac), which draws ammonia out of the bloodstream and removes it through more frequent bowel movements, Xifaxan works by decreasing ammonia-producing bacteria in the intestines. This helps prevent the buildup of ammonia and other toxins that can affect brain function.
Xifaxan is typically prescribed as an add-on to lactulose for adults who have had a recurrence of HE while on lactulose alone, or who need additional long-term prevention of encephalopathy episodes. It is generally used alongside regular monitoring by your healthcare provider, such as tracking symptoms and mental status.
WHO XIFAXAN MAY BE SUITABLE FOR
Eligibility for Xifaxan depends on your history of hepatic encephalopathy, current treatment, and overall liver condition. Your healthcare provider may prescribe Xifaxan if you have a history of recurrent HE, need additional therapy alongside lactulose, have persistent symptoms despite standard treatment, or need long-term prevention of encephalopathy recurrence.
AASLD guidance recommends rifaximin as an add-on to lactulose for the prevention of recurrent HE episodes after a second episode. EASL guidelines similarly note that rifaximin is primarily used as add-on therapy to lactulose for secondary prevention in patients who have had at least one recurrence of overt HE while on lactulose alone.
Because every patient's liver condition and treatment history are different, there is no one-size-fits-all answer to who should take Xifaxan. Your medical history, current medications, and response to lactulose all factor into whether Xifaxan is an appropriate option. Treatment decisions are individualized and should be made by a qualified healthcare professional after a full assessment of your liver condition and treatment goals.
ELIGIBILITY OVERVIEW
Your healthcare provider may prescribe Xifaxan if you have any of the following:
Before recommending Xifaxan, healthcare providers evaluate several factors to determine whether it is an appropriate option, including:
HOW XIFAXAN CAN HELP YOUR LIVER
Xifaxan works in the gut rather than throughout the body. Rifaximin, its active ingredient, decreases ammonia-producing bacteria in the intestines, which lowers the amount of ammonia and related toxins that can reach the bloodstream and affect brain function.
As ammonia-producing bacteria decrease, less ammonia is absorbed, which can help improve cognitive function and mental clarity and reduce the recurrence of hepatic encephalopathy episodes. Xifaxan complements lactulose therapy when the two are used together: lactulose removes ammonia already in the gut, while Xifaxan reduces how much ammonia the gut bacteria produce in the first place.
For patients with a history of recurrent HE, this combined, gut-directed approach can support treatment goals such as fewer HE episodes, fewer related hospitalizations, and more stable mental status over time. Xifaxan is not used on its own for HE recurrence prevention — providers pair it with lactulose and regular monitoring of symptoms and mental status.
LIVER BENEFITS
Xifaxan is an antibiotic that acts mainly inside the intestines. Its active ingredient, rifaximin, decreases the gut bacteria that produce ammonia. With fewer of these bacteria, less ammonia is made in the first place, so less of it can reach the bloodstream and affect the brain.
Ammonia is not the only substance gut bacteria release that can interfere with brain function. By lowering the number of ammonia-producing bacteria, Xifaxan also reduces the production of other toxins linked to hepatic encephalopathy. This gut-directed approach changes the gut microbiome rather than treating the liver itself.
When fewer toxins build up, the brain is less exposed to substances that cloud thinking. Over time, people may notice improved cognitive function and mental clarity, such as less confusion. Response differs from person to person, which is why your care team tracks your mental status during treatment.
Xifaxan is used as maintenance therapy, so its value builds with steady, ongoing use. Providers often continue it for as long as a patient benefits, and they check symptoms, mental status, and treatment response along the way. This routine follow-up helps your team decide whether the plan still fits your needs.
Xifaxan works in the gut to reduce ammonia-producing bacteria, helping prevent recurrent hepatic encephalopathy when used alongside lactulose. It should only be started and monitored under the guidance of a qualified healthcare professional.
TREATMENT PROCESS
Xifaxan is supplied as an oral tablet. Take it exactly as prescribed by your healthcare provider, and check with your pharmacist if you have any questions about your specific tablet strength.
The typical dose is 550 mg twice daily. Your healthcare provider determines the right dose for you.
Take Xifaxan with or without food, as directed by your healthcare provider. Always use it exactly as directed, and do not adjust your dose without medical guidance.
Xifaxan is typically used as long-term maintenance therapy to help prevent recurrent episodes of hepatic encephalopathy. Treatment is often continued indefinitely in patients who benefit from therapy, particularly when used in combination with lactulose.
Store Xifaxan tablets at room temperature, away from moisture and heat.
Your healthcare provider will regularly monitor your symptoms, mental status, and treatment response. Continue taking lactulose if it has been prescribed, along with Xifaxan and other liver medications as directed. Report any side effects or unusual symptoms to your healthcare provider.
BENEFITS AND SAFETY
Xifaxan (rifaximin) may support people with a history of recurrent hepatic encephalopathy by acting in the gut to reduce ammonia-producing bacteria and the toxins they generate. This gut-directed action helps lower the ammonia that reaches the bloodstream, which can support improved cognitive function, mental clarity, and fewer HE episodes. Because Xifaxan has minimal systemic absorption, it is generally well tolerated. The extent of these benefits varies from person to person, depending on liver condition, response to lactulose, and overall health.
Xifaxan is not typically used as a stand-alone treatment for HE recurrence — it works best as an add-on to lactulose, combined with ongoing monitoring of symptoms and mental status by your healthcare provider.
As with any medication, Xifaxan may cause side effects, most commonly mild digestive or systemic symptoms. Your healthcare provider will discuss the potential benefits and risks before treatment and monitor your response throughout therapy.
BENEFITS
The main benefit is control at the source. Because rifaximin lowers the number of ammonia-producing bacteria in the gut, ammonia is kept in check by prevention rather than only by removal. This steady effect is why Xifaxan is taken on a regular schedule instead of only when symptoms appear.
For people who have already had hepatic encephalopathy, the goal is to avoid another episode. Xifaxan lowers the risk of future episodes, which can also mean fewer related hospital stays. It matters most for patients whose symptoms returned despite standard treatment.
Xifaxan is usually added to lactulose, not used in its place. Each medicine tackles ammonia from a different side, and together they offer stronger control than lactulose alone. If you take both, keep taking lactulose unless your provider tells you otherwise.
Very little Xifaxan is absorbed into the bloodstream, so most of the medicine stays in the gut where it is needed. This is why many patients tolerate it well over long-term use. Side effects can still occur, so tell your healthcare provider about any new or lasting symptoms.
Xifaxan has minimal systemic absorption and is generally well tolerated. Your healthcare provider will discuss the potential benefits and risks before treatment and provide ongoing support, including symptom and mental status monitoring.
SUPPORTING YOUR RESULTS
Xifaxan works best as part of a broader care plan. Continue taking lactulose if it has been prescribed, along with Xifaxan and other liver medications, exactly as directed.
Avoiding alcohol, staying well hydrated, and following your healthcare team's dietary recommendations can help support your liver health alongside Xifaxan therapy.
Areas that may support treatment:
COMMON QUESTIONS
No, Xifaxan is not a cure for hepatic encephalopathy. Xifaxan is a maintenance therapy that reduces ammonia-producing bacteria in the gut, which can improve mental clarity and lower the risk of recurrent hepatic encephalopathy episodes when used alongside lactulose. It does not reverse the underlying liver disease that causes encephalopathy. Benefits vary from person to person based on liver condition and response to treatment. Talk with your healthcare provider about realistic goals for your treatment plan and how Xifaxan fits into your overall care.
No, Xifaxan is not typically used as a replacement for lactulose. Lactulose remains the first-line treatment for hepatic encephalopathy, and Xifaxan is usually added when a patient has a recurrence of hepatic encephalopathy while taking lactulose alone or needs additional long-term prevention. Most patients continue both medications together, since lactulose removes ammonia already in the gut while Xifaxan reduces how much ammonia the gut bacteria produce. Never stop or change either medication without guidance from your healthcare provider.
Xifaxan and lactulose both lower ammonia levels, but they work in different ways. Lactulose draws ammonia out of the bloodstream and removes it through more frequent bowel movements, while Xifaxan, an antibiotic, decreases the intestinal bacteria that produce ammonia in the first place. Because Xifaxan has minimal systemic absorption, it acts mainly in the gut. The two medications are often prescribed together for more complete control of hepatic encephalopathy. Ask your healthcare provider how each medication fits into your treatment plan.
Common side effects of Xifaxan include nausea, abdominal discomfort, dizziness, fatigue, and peripheral swelling, known as edema. Because Xifaxan has minimal systemic absorption, it is generally well tolerated compared with medications that act throughout the body. Most side effects are mild, but some patients may need dose adjustments or additional monitoring. Contact your healthcare provider promptly if you notice new or worsening symptoms, or if side effects interfere with daily activities. Your healthcare provider can help determine whether these effects are related to Xifaxan or another cause.
Most patients take Xifaxan long term as maintenance therapy to help prevent recurrent hepatic encephalopathy episodes. Treatment is often continued indefinitely in patients who respond well, particularly when Xifaxan is combined with lactulose. Your healthcare provider will monitor your symptoms, mental status, and treatment response over time to decide whether to continue, adjust, or stop therapy. Never discontinue Xifaxan on your own, even if you feel well, since stopping suddenly may increase the risk of a hepatic encephalopathy recurrence. Discuss any changes with your healthcare provider first.
Medical disclaimer: LiverDirectory provides educational information and a directory of providers. It does not provide medical advice, diagnosis, or treatment. Always consult a licensed physician regarding any medical condition.
