title: Evaluation of oral cannabinoid-containing medications for the management of interferon and ribavirin-induced anorexia, nausea and weight loss in patients treated for chronic hepatitis C virus.
abstract: OBJECTIVE
  The systemic and cognitive side effects of hepatitis C virus (HCV) therapy may be incapacitating, necessitating dose reductions or abandonment of therapy. Oral cannabinoid-containing medications (OCs) ameliorate chemotherapy-induced nausea and vomiting, as well as AIDS wasting syndrome. The efficacy of OCs in managing HCV treatment-related side effects is unknown.
  
  
  METHODS
  All patients who initiated interferon-ribavirin therapy at The Ottawa Hospital Viral Hepatitis Clinic (Ottawa, Ontario) between August 2003 and January 2007 were identified using a computerized clinical database. The baseline characteristics of OC recipients were compared with those of nonrecipients. The treatment-related side effect response to OC was assessed by c2 analysis. The key therapeutic outcomes related to weight, interferon dose reduction and treatment outcomes were assessed by Student's t test and c2 analysis.
  
  
  RESULTS
  Twenty-five of 191 patients (13%) initiated OC use. Recipients had similar characteristics to nonrecipients, aside from prior marijuana smoking history (24% versus 10%, respectively; P=0.04). The median time to OC initiation was seven weeks. The most common indications for initiation of OC were anorexia (72%) and nausea (32%). Sixty-four per cent of all patients who received OC experienced subjective improvement in symptoms. The median weight loss before OC initiation was 4.5 kg. A trend toward greater median weight loss was noted at week 4 in patients eventually initiating OC use (-1.4 kg), compared with those who did not (-1.0 kg). Weight loss stabilized one month after OC initiation (median 0.5 kg additional loss). Interferon dose reductions were rare and did not differ by OC use (8% of OC recipients versus 5% of nonrecipients). The proportions of patients completing a full course of HCV therapy and achieving a sustained virological response were greater in OC recipients.
  
  
  CONCLUSIONS
  The present retrospective cohort analysis found that OC use is often effective in managing HCV treatment-related symptoms that contribute to weight loss, and may stabilize weight decline once initiated.
authors.affiliation: Department of Internal Medicine, University of Ottawa, Ottawa, Canada.
authors.forename: Cecilia T
authors.initials: CT
authors.lastname: Costiniuk
authors.forename: Edward
authors.initials: E
authors.lastname: Mills
authors.forename: Curtis L
authors.initials: CL
authors.lastname: Cooper
mesh_terms: D000328:Adult; D000855:Anorexia / Q000139:chemically induced / Q000188:drug therapy; D000998:Antiviral Agents / Q000009:adverse effects*; D002186:Cannabinoids / Q000494:pharmacology / Q000627:therapeutic use*; D004305:Dose-Response Relationship, Drug; D005260:Female; D019698:Hepatitis C, Chronic / Q000188:drug therapy*; D006801:Humans; D007372:Interferons / Q000009:adverse effects*; D008297:Male; D008875:Middle Aged; D009325:Nausea / Q000139:chemically induced / Q000188:drug therapy; D012189:Retrospective Studies; D012254:Ribavirin / Q000009:adverse effects*; D016896:Treatment Outcome; D015431:Weight Loss / Q000187:drug effects
chemical_list: D000998:Antiviral Agents; D002186:Cannabinoids; D012254:Ribavirin; D007372:Interferons