Hepatic encephalopathy (HE) commonly occurs after transjugular intrahepatic portosystemic shunt (TIPS). Ursodeoxycholic acid (UDCA) has been reported to alleviate neurodegenerative disease recently. This open-label multicenter randomized controlled trial tests whether adding UDCA (13-15 mg/kg/day) to standard lactulose prophylaxis reduces the incidence of overt HE (OHE; West Haven grade II-IV) after TIPS, compared with lactulose alone. The regimen starts within 72 hours before TIPS and continues for 3 months. The trial aims to evaluate the effect of UDCA in reducing the incidence of post-TIPS OHE.

Post-TIPS OHE occurs in 35-50% of patients and worsens quality of life and resource use. Existing guidance consistently recommends lactulose as the backbone therapy for HE and for secondary prophylaxis, titrated to 2-3 soft stools/day; however, evidence for primary prophylaxis after TIPS has been limited and heterogeneous, and consensus varies across documents. Hydrophilic bile acids, especially ursodeoxycholic acid (UDCA), have demonstrated important anti-apoptotic and neuroprotective activities in clinical practice. Published experimental and clinical evidence suggests its potential therapeutic use as a disease-modifier in neurodegenerative and metabolic brain diseases. This trial evaluates whether bile-acid modulation with UDCA at standard hepatology dosing (13-15 mg/kg/day) combined with lactulose reduces early post-TIPS OHE. The protocol uses stratified randomization, prespecified outcome adjudication (West Haven), and intention-to-treat analysis. Key secondary endpoints include mortality, transplant-free survival, minimal HE tests (PHES, Stroop test), frailty, quality of life, and bile-acid/metabolomic profiling in optional sub-studies.

Inclusion Criteria:

• Age 18-80 years.
• Confirmed cirrhosis (biopsy, elastography, or standard radiologic/biochemical criteria).
• Elective TIPS for (a) refractory/recurrent ascites and/or (b) recurrent variceal bleeding not responsive to treatment with endoscopic band ligation and beta-blockers.
• Preemptive TIPS for patients with variceal bleeding and Child-Pugh C (10-13 points), patients with Child-Pugh B and active bleeding during endoscopy, or patients with hepatic venous pressure gradient (HVPG) ≥ 20 mmHg.
• Ability to start study drug within 72 hours before TIPS.
• Signed informed consent.

Exclusion Criteria:

• Contraindications to TIPS (e.g., severe heart failure ≥NYHA III, severe pulmonary hypertension, uncontrolled sepsis, advanced HCC at risk with TIPS, unrelieved biliary obstruction, Child-Pugh score >13, main-trunk PVT if not recanalizable, technical infeasibility).
• Prior OHE grade II-IV without precipitating factor; overt neurological disease affecting cognition (e.g., Parkinson's, Alzheimer's).
• Current or planned ursodeoxycholic acid (UDCA) therapy for an approved indication (e.g., primary biliary cholangitis), or UDCA use within the prior 3 months.
• Current/recent rifaximin use (<3 months) or strong UDCA contraindication/hypersensitivity.
• Salvage TIPS.
• Non-cirrhotic portal hypertension.
• Pregnancy/lactation.
• Any condition that, in investigators' judgment, precludes safe participation.