title: Penciclovir cream for the treatment of sunlight-induced herpes simplex labialis: a randomized, double-blind, placebo-controlled trial. Penciclovir Cream Herpes Labialis Study Group.
abstract: OBJECTIVE
  The purpose of this study was to further define the therapeutic value of penciclovir cream in the treatment of sunlight-induced herpes labialis by comparing its efficacy and tolerability with those of an inactive control (purified water).
  
  
  METHODS
  In this randomized, double-blind, placebo-controlled, parallel-group clinical trial, lesions were induced by exposure to sunlight. Treatment was self-initiated within 1 hour of development of the signs or symptoms of a recurrence.
  
  
  RESULTS
  Healthy male and female patients (mean age, 38.3 years; range, 18 to 81 years) who had a history of sunlight-induced herpes labialis (mean of 6 recurrences in previous 12 months) applied either penciclovir cream (n = 266) or purified water (n = 275). Penciclovir cream significantly decreased the time to lesion healing (P < 0.001), with a reduction in median time of up to 2 days. The efficacy of penciclovir cream was further supported by a significant reduction in maximum lesion area (P = 0.008), a faster loss of lesion-associated symptoms (P = 0.026), and significant reductions in daily assessments of pain (P < or = 0.040), itching (P < or = 0.032), burning (P < or = 0.028), and tenderness (P < or = 0.026) as moderate or severe. These effects were reinforced by the results of the daily self-assessment of lesion attributes, with significantly fewer severe/extreme assessments of lesion size (P < or = 0.003), noticeability (P < or = 0.003), amount of scab/crust (P < or = 0.003), raised/ swollen area (P < or = 0.040), soreness/tenderness (P < or = 0.043), and overall severity (P < or = 0.001) throughout the study period.
  
  
  CONCLUSIONS
  Penciclovir cream has demonstrated efficacy for a broad range of clinically important outcomes. Significant effects on lesion area, lesion symptoms, and other lesion attributes extend the clinical efficacy of penciclovir cream beyond lesion healing.
authors.affiliation: Research & Development, SmithKline Beecham Consumer Healthcare, Weybridge, Surrey, United Kingdom.
authors.forename: R
authors.initials: R
authors.lastname: Boon
authors.forename: J J
authors.initials: JJ
authors.lastname: Goodman
authors.forename: J
authors.initials: J
authors.lastname: Martinez
authors.forename: G L
authors.initials: GL
authors.lastname: Marks
authors.forename: M
authors.initials: M
authors.lastname: Gamble
authors.forename: C
authors.initials: C
authors.lastname: Welch
mesh_terms: D000212:Acyclovir / Q000008:administration & dosage / Q000009:adverse effects / Q000031:analogs & derivatives* / Q000627:therapeutic use; D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000998:Antiviral Agents / Q000008:administration & dosage / Q000009:adverse effects / Q000627:therapeutic use*; D004311:Double-Blind Method; D005260:Female; D006147:Guanine; D006560:Herpes Labialis / Q000188:drug therapy* / Q000473:pathology; D006801:Humans; D008297:Male; D008875:Middle Aged; D009824:Ointments; D013472:Sunlight / Q000009:adverse effects*
chemical_list: D000998:Antiviral Agents; D009824:Ointments; C053539:penciclovir; D006147:Guanine; D000212:Acyclovir