An Open Study to Evaluate the Sustained Effect in Patients Showing Virological Responses With Muscle-related Symptom of Chronic Hepatitis B Patients Who Received Clevudine.

Inclusion Criteria:

1. Patients is currently clevudine treatment.
2. Patients with HBV DNA < 300 cpoies/mL and ALT normal Showing Muscle-related Symptom Who received Clevudine
3. Patient who is able to give written informed consent prior to study start and to comply with the study requirements.

Exclusion Criteria:

1. Patient is currently receiving antiviral, immunomodulatory, cytotoxic or corticosteroid therapy.
2. Patient is pregnant or breast-feeding.
3. Patient has a significant gastrointestinal, renal, decompensated liver, bronchopulmonary, neurological, cardiac, oncologic(except HCC)or allergic disease.
4. Patient, in the opinion of the investigator, unsuitable for the study.
5. Showing Muscle-related Symptom who any other evidence.

An Open Study to Evaluate the Sustained Effect in Patients Showing Virological Responses With Muscle-related Symptom of Chronic Hepatitis B Patients Who Received Clevudine