A randomized trial of amantadine and interferon versus interferon alone as initial treatment for chronic hepatitis C

Hepatology. 2001 Apr;33(4):989-93. doi: 10.1053/jhep.2001.23537.


The aim of this study was to compare, in an open-label study, the efficacy and safety of a combination of interferon (IFN) and amantadine (AMA) with that of IFN alone in previously untreated patients with chronic hepatitis C. A total of 200 patients were randomized to 6 MU of IFN-alpha2a 3 times per week, with 200 mg of AMA daily (n = 99) or to an identical dose of interferon alpha2a (n = 101). Patients were treated for 12 months and observed for 6 months' posttreatment. At the completion of treatment, 28.7% of patients in the monotherapy group and 45.5% in the combination group had a virologic response (P =.014). At 6 months' posttreatment, a sustained virologic response was observed in 16.8% (95% CI: 9-23) of patients with IFN alone versus 29.3% (95% CI: 19-37) of patients who were treated with combination therapy (P =.036). In each of the 2 treatments, genotype was the only predictive parameter for a sustained response. At the logistic regression analysis, therapy and genotype were the only 2 parameters with an independent predictive value. In the combination group, at examination of month 3, hepatitis C virus (HCV)-RNA status had a 97.6% (95% CI: 93-102) positive predictive value and a 50% (95% CI: 37-63) negative predictive value for a sustained virologic clearance. A substantial proportion of naïve patients with chronic hepatitis C have an end-of-treatment and end-of-follow-up virologic and biochemical response to a combination of IFN and AMA. This new treatment appears safe and well tolerated.

Publication types

  • Clinical Trial
  • Multicenter Study
  • Randomized Controlled Trial

MeSH terms

  • Adult
  • Aged
  • Alanine Transaminase / blood
  • Amantadine / adverse effects
  • Amantadine / therapeutic use*
  • Antiviral Agents / adverse effects
  • Antiviral Agents / therapeutic use*
  • Drug Therapy, Combination
  • Female
  • Genotype
  • Hepacivirus / genetics
  • Hepatitis C, Chronic / blood
  • Hepatitis C, Chronic / drug therapy*
  • Hepatitis C, Chronic / virology
  • Humans
  • Interferons / adverse effects
  • Interferons / therapeutic use*
  • Male
  • Middle Aged
  • Predictive Value of Tests
  • RNA, Viral / analysis
  • Safety


  • Antiviral Agents
  • RNA, Viral
  • Interferons
  • Amantadine
  • Alanine Transaminase