Patient-initiated, twice-daily oral famciclovir for early recurrent genital herpes. A randomized, double-blind multicenter trial. Canadian Famciclovir Study Group

JAMA. 1996 Jul 3;276(1):44-9.


Objective: To compare the efficacy and safety of episodic patient-initiated oral famciclovir with placebo in recurrent genital herpes.

Design: Randomized, double-blind, frequent-observation, dose-ranging study comparing twice-daily 125-mg, 250-mg, or 500-mg oral famciclovir with placebo. Patients initiated therapy after self-culturing, reported to the clinic within 12 hours, and were assessed twice daily for at least 5 days.

Setting: Fifteen Canadian university, private practice, or public outpatient clinics.

Patients: A total of 692 patients with culture-proven recurrent genital herpes were randomized; 467 patients experienced a symptomatic episode and commenced treatment.

Main outcome measure: Time to complete healing of all lesions.

Results: Famciclovir (all doses) was significantly more effective than placebo in reducing time to healing, time to cessation of viral shedding, and durations of lesion edema, vesicles, ulcers, and crusts. Times to cessation of all symptoms and of moderate to severe lesion tenderness, pain, and burning were also reduced. Patients who initiated famciclovir prior to viral shedding were more likely to not shed virus throughout. All doses were equally effective, safe, and well tolerated.

Conclusions: Oral famciclovir reduced the onset and duration of viral shedding, lesion persistence, and uncomfortable symptoms. Several individual symptoms and lesion stages were also reduced in duration by this episodic therapy. Additionally, our twice-daily observation trial design proved to be a helpful tool for studying recurrent disease. Episodic oral famciclovir provides a convenient and effective alternative for those patients with recurrent genital herpes whose frequency rates do not require continuous antiviral suppression.

Publication types

  • Clinical Trial
  • Multicenter Study
  • Randomized Controlled Trial
  • Research Support, Non-U.S. Gov't

MeSH terms

  • 2-Aminopurine / administration & dosage
  • 2-Aminopurine / adverse effects
  • 2-Aminopurine / analogs & derivatives*
  • 2-Aminopurine / therapeutic use
  • Administration, Oral
  • Adult
  • Antiviral Agents / administration & dosage
  • Antiviral Agents / adverse effects
  • Antiviral Agents / therapeutic use*
  • Double-Blind Method
  • Drug Administration Schedule
  • Famciclovir
  • Female
  • Herpes Genitalis / drug therapy*
  • Herpes Genitalis / physiopathology
  • Humans
  • Male
  • Middle Aged
  • Prodrugs / administration & dosage
  • Prodrugs / adverse effects
  • Prodrugs / therapeutic use*
  • Proportional Hazards Models
  • Recurrence
  • Simplexvirus / isolation & purification
  • Virus Shedding


  • Antiviral Agents
  • Prodrugs
  • 2-Aminopurine
  • Famciclovir