Eligibility Criteria:
Inclusion Criteria: (should follow all conditions described below)
* Etiology : Liver cirrhosis patients of any etiology, whether viral or non-viral
* Occurrence of muscle cramp equal to or more than 2 times a week over the last month
Exclusion Criteria:
* Preexisting disease : Occlusive vascular disease, thyroid disease, peripheral neuropathy
* Drugs within 2 months : Digitalis, cimetidine, clofibrate, lithium, opiate, nifedipine, beta-agonist, beta-blocker, penicillamine, gabapentin, pregabalin, tricyclic anti-depressant, carbamazepine, phenytoin, quinidine, antispastic drugs, verapamil, vitamin E, branched chain amino acid, excessive alcohol consumption (male \>40 g/day, female \>20 g/day)
* Underlying disease : Renal impairment (Ccr \< 60 mL/min), neuromuscular disease (stroke, cerebral palsy, multiple sclerosis, Parkinson disease, progressive muscular dystrophy, epilepsy), suicidal attack, drug allergy, pregnancy, heart failure
* Liver status : Serious complications resulting from decompensated cirrhosis except ascites, such as portosystemic encephalopathy, acute variceal bleeding within the past 3 months from study entry
* central nervous system (CNS) or peripheral nervous system (PNS) or muscular disease, stroke, cerebral palsy, multiple sclerosis, Parkinson disease, progressive muscular dystrophy, epilepsy
* The previous episode of suicidal attack
* Drug hypersensitivity
* Subjects receiving antiepileptic drugs
* Patients manipulating machines or driving cars
* Pregnant women
* Subjects with congestive heart failure requiring medications
* Galactose-Lactose metabolic abnormality
* Refractory ascites to medical treatment