By administering a composition comprising pumpkin seed, safflower, plantain and honeysuckle, subjective symptoms (for example, general malaise and abdominal swelling) of a patient with chronic hepatitis C can be eliminated and, moreover, objective symptoms diagnosed by a medical doctor (for example, liver enlargement and palm erythema) can be relieved or eliminated. From 1 to 3 months after the administration of the composition, a significant decrease in hepatitis C virus RNA level is gradually observed. Therefore, the above composition is useful at least as a composition for treating chronic hepatitis C. In particular, it is advantageous in treating a chronic hepatitis C patient showing a high chronic hepatitis C virus RNA level.