title: A multicentre, single-blind, randomized comparison of a fixed clindamycin phosphate/tretinoin gel formulation (Velac) applied once daily and a clindamycin lotion formulation (Dalacin T) applied twice daily in the topical treatment of acne vulgaris.
abstract: BACKGROUND
  A successful phase III pilot study compared the efficacy and safety of a fixed clindamycin 1%/tretinoin 0.025% gel formulation (CTG; Velac gel) applied once daily and a clindamycin 1% lotion formulation (CLN; Dalacin T lotion) applied twice daily in the treatment of moderate to severe acne vulgaris.
  
  
  OBJECTIVE
  We aimed to follow up this study.
  
  
  METHODS
  The two treatment regimens were compared in a multicentre, single-blind, randomized 12-week investigation of patients with moderate to severe acne vulgaris.
  
  
  RESULTS
  At week 12, the mean percentage reduction in non-inflamed lesions (open and closed comedones) was greater in the CTG group compared with the CLN group (P = 0.05). Absolute reductions in open and closed comedones were also greater in the CTG group, consistent with the comedolytic activity of tretinoin. There was a significantly greater absolute reduction in inflamed lesions (pustules, papules and nodules) from baseline to both end-point (last observed efficacy outcome; P = 0.043) and week 12 (P = 0.018) in the CTG group compared with the CLN group. Evaluation of the calculated overall acne severity score, considering all five lesion subtypes, demonstrated a significantly greater mean percentage reduction in the CTG group compared with the CLN group, both at end-point (P = 0.01) and at week 12 (P < 0.01). The more subjective assessment of overall acne severity according to the Cook scale also demonstrated a significantly greater mean reduction in the CTG group than the CLN group after 12 weeks of therapy (P = 0.007). CTG had a more rapid effect on the onset of improvement compared with CLN; a 50% reduction in total lesion counts by day 60 was found in 77% of patients on CTG compared with 56% receiving CLN (P = 0.003). This was largely due to the reduction in open comedone counts (P = 0. 0006). For all other variables, CTG was at least as effective as CLN. Both treatments were well tolerated.
  
  
  CONCLUSIONS
  A single daily topical application of Velac gel was superior to Dalacin T lotion applied twice daily in reducing overall acne scores, and was faster acting. The simpler dosing regimen of Velac gel and its rapid effect are likely to have a positive effect on both patient compliance and cost.
authors.affiliation: Department of Dermatology, University Medical Center Benjamin Franklin, The Free University of Berlin, Fabeckstrasse 60-62, 14195 Berlin, Germany.
authors.forename: C C
authors.initials: CC
authors.lastname: Zouboulis
authors.forename: L
authors.initials: L
authors.lastname: Derumeaux
authors.forename: J
authors.initials: J
authors.lastname: Decroix
authors.forename: B
authors.initials: B
authors.lastname: Maciejewska-Udziela
authors.forename: F
authors.initials: F
authors.lastname: Cambazard
authors.forename: A
authors.initials: A
authors.lastname: Stuhlert
mesh_terms: D000152:Acne Vulgaris / Q000188:drug therapy*; D000287:Administration, Topical; D000293:Adolescent; D000328:Adult; D000900:Anti-Bacterial Agents / Q000008:administration & dosage*; D002981:Clindamycin / Q000008:administration & dosage*; D004338:Drug Combinations; D005260:Female; D006801:Humans; D008297:Male; D010349:Patient Compliance; D012720:Severity of Illness Index; D016037:Single-Blind Method; D016896:Treatment Outcome; D014212:Tretinoin / Q000008:administration & dosage*
chemical_list: D000900:Anti-Bacterial Agents; D004338:Drug Combinations; C117880:clindamycin, tretinoin drug combination; D002981:Clindamycin; D014212:Tretinoin