Carvedilol and Alverine in Portal Hypertension

On the basis of maintaining unchanged routine hepatoprotective and symptomatic supportive treatments and the original dose of carvedilol, participants will be administered with compound alverine citrate capsules (Le Jian Su; specification: each capsule contains alverine citrate 60 mg and simeticone 300 mg; manufactured by Laboratoires MAYOLY SPINDLER), at a dosage of 180 mg/day (1 capsule orally, 3 times a day), for a continuous period of 24 weeks.