title: Two randomized, double-blind, controlled trials of 2219 subjects to compare the combination clindamycin/tretinoin hydrogel with each agent alone and vehicle for the treatment of acne vulgaris.
abstract: BACKGROUND
  The development of a hydrogel to stabilize and solubilize clindamycin and tretinoin provides a single, once-daily treatment for acne vulgaris.
  
  
  OBJECTIVE
  Our aim was to compare the efficacy and safety of the combination of clindamycin (1%) and tretinoin (0.025%) with each agent alone and vehicle.
  
  
  METHODS
  Two randomized, double-blind, active drug- and vehicle-controlled 12-week studies evaluated inflammatory and noninflammatory lesion counts and the Investigator's Static Global Assessment in 2219 subjects with acne vulgaris.
  
  
  RESULTS
  The combination demonstrated superior efficacy to clindamycin, tretinoin, and vehicle. Combination hydrogel was significantly more effective in reducing inflammatory (P < .005), noninflammatory (P < or = .0004), and total (P < .0001) lesion counts than the other treatments and vehicle. The proportion of subjects with clear or almost clear skin on the Investigator's Static Global Assessment was greater with the combination (P < .0001).
  
  
  CONCLUSIONS
  A majority of subjects (82.6%) had grade 2-3 acne vulgaris at baseline; therefore these overall results may not be representative of the response in the subjects (17.4%) with grade 4-5 acne.
  
  
  CONCLUSIONS
  The combination clindamycin/tretinoin hydrogel was well tolerated and significantly more effective than clindamycin, tretinoin, or vehicle for the treatment of acne vulgaris.
authors.affiliation: Department of Dermatology, University of Pennsylvania Hospital, Philadelphia, Pennsylvania, USA. jjleyden@mindspring.com
authors.forename: James J
authors.initials: JJ
authors.lastname: Leyden
authors.forename: Lincoln
authors.initials: L
authors.lastname: Krochmal
authors.forename: Alex
authors.initials: A
authors.lastname: Yaroshinsky
mesh_terms: D000152:Acne Vulgaris / Q000188:drug therapy* / Q000473:pathology; D000293:Adolescent; D000900:Anti-Bacterial Agents / Q000009:adverse effects / Q000627:therapeutic use*; D002981:Clindamycin / Q000009:adverse effects / Q000627:therapeutic use*; D003872:Dermatitis / Q000473:pathology; D004311:Double-Blind Method; D004359:Drug Therapy, Combination; D005260:Female; D006801:Humans; D020136:Hydrogel, Polyethylene Glycol Dimethacrylate / Q000627:therapeutic use*; D008297:Male; D012720:Severity of Illness Index; D016896:Treatment Outcome; D014212:Tretinoin / Q000009:adverse effects / Q000627:therapeutic use*
chemical_list: D000900:Anti-Bacterial Agents; D020136:Hydrogel, Polyethylene Glycol Dimethacrylate; D002981:Clindamycin; D014212:Tretinoin