AIM: To investigate the safety and efficacy of the formulation HD-03/ES capsules in the management of patients with chronic hepatitis B infection.METHODS: A total of 25 patients were recruited to the study and were given HD-03/ES, two capsules twice daily for six months. Clinical assessment of symptoms and signs were done using the "clinical observation table" once a month before and after the treatment.Biochemical investigations of total bilirubin, ALT, AST,serum protein for liver function tests were done every month after initiating treatment. Serum was analyzed for HBV markers for HBsAg, HBeAg and HBV DNA at baseline, 4 and 6 mo after therapy using ELISA kits from Roche.RESULTS: After 6 mo of therapy with HD-03/ES, a significant reduction of ALT values from 66.5 ± 11.1 to 39.1 ± 5.2 (P ＜ 0.01) and a significant HBsAg loss (52%,P ＜ 0.001), HBeAg loss (60%, P ＜ 0.05) and HBV DNA loss (60%, P ＜ 0.05) was observed. Adverse effects were mild and never warranted withdrawal of the drug.CONCLUSION: The results of this pilot study indicate that HD-03/ES might be a safe and effective treatment for chronic hepatitis B infection and a long-term multicentric comparator trial is warranted and under way.