In an open, randomized, clin. pilot trial, four groups with 20 hepatitis C patients each were treated with either "liver support" therapy, with established medications (one group with ribavirin, one group with α-interferon), or with a novel oral test drug, Phlogenzym, a combination of hydrolytic enzymes with the flavonoid rutosid.The liver transaminases, AST, ALT, and S-γ-GT markedly improved over the period of three months in the three drug groups, but only marginally in the liver support group.The best results were found with Phlogenzym, which was even superior to ribavirin and α-interferon.The tolerance of the oral enzymes was excellent.Further clin. trials with longer observation times, greater numbers of patients, double-blind and partly placebo-controlled, are under way.