Management of Hepatic Encephalopathy When Lactulose is Held Due to Diarrhea

Alternative Treatment Options During Lactulose Interruption

Rifaximin is the most appropriate alternative when lactulose must be temporarily discontinued due to diarrhea, with a dosage of 400 mg three times daily or 550 mg twice daily, and it works by inhibiting bacterial RNA synthesis, reducing ammonia-producing bacteria, with therapeutic effects similar to lactulose/lactitol 1, 2
The American Association for the Study of Liver Diseases recommends rifaximin as the primary treatment until diarrhea resolves and lactulose can be reintroduced, with an advantage of not causing diarrhea as it remains in the intestine without being absorbed 1, 2
L-Ornithine-L-Aspartate (LOLA) can be used as an alternative agent when lactulose is held, with a mechanism of helping metabolize ammonia to urea and glutamine, and clinical benefit of lowering plasma ammonia concentrations and improving hepatic encephalopathy symptoms, with an OR of 2.06-3.04 and shorter symptom recovery time 2, 3, 4
Branched-Chain Amino Acids (BCAAs) can be used as an alternative therapy during lactulose interruption, with a recommended dosage of 0.25 g/kg/day, and are particularly useful when protein restriction is necessary but nutritional support is required 1, 2, 4

The goal of lactulose reintroduction is to achieve 2-3 soft stools per day without diarrhea, and monitoring stool consistency and frequency closely is crucial when reintroducing lactulose 5

The management algorithm involves temporarily holding lactulose when significant diarrhea develops, starting rifaximin 550 mg twice daily or 400 mg three times daily, and considering adding IV LOLA 30 g/day if encephalopathy is severe, with identification and treatment of any precipitating factors for HE 1, 2, 3, 6
The European Association for the Study of the Liver recommends continuing rifaximin as add-on therapy to prevent recurrence, and gradual titration of lactulose to achieve 2-3 soft stools daily 1, 5, 7

The American College of Gastroenterology advises avoiding simple laxatives as they lack the prebiotic properties of disaccharides, and not using sedatives or benzodiazepines in patients with HE as they may worsen encephalopathy, with ensuring adequate hydration during diarrhea episodes to prevent dehydration 1, 6, 7
Monitoring for electrolyte abnormalities, particularly hypokalemia, which can worsen HE, is crucial, and rifaximin has limitations in severe HE due to need for oral administration 2, 6