title: Tolerability of Topical Retinoids: Are There Clinically Meaningful Differences Among Topical Retinoids?
abstract: BACKGROUND
  Topical retinoids are first-line treatment options for acne vulgaris. These drugs, however, produce varying degree of cutaneous irritation within the first few weeks of treatment.
  
  
  OBJECTIVE
  Our purpose was to examine differences in tolerability of topical retinoids and assess whether these differences would be clinically meaningful.
  
  
  METHODS
  A PubMed search was performed for sources on topical retinoids in acne vulgaris treatment. Thirty-four clinical studies were analyzed.
  
  
  RESULTS
  Thirteen studies had statistically significant results on tolerability of retinoid based on retinoid, vehicle, concentration, or skin type. All studies classified most of skin reactions as mild-moderate. Large differences in the number of dropouts due to irritation were not identified.
  
  
  CONCLUSIONS
  Irritation studies did not show a high frequency of clinically significant irritation with topical retinoids. We anticipate that the large variation in patient use of topical retinoids would likely account for more variation in response than differences between drug formulations.
authors.affiliation: Center for Dermatology Research, Departments of Dermatology, Wake Forest School of Medicine, Winston-Salem, NC, USA.
authors.forename: Leonora
authors.initials: L
authors.lastname: Culp
authors.affiliation: Center for Dermatology Research, Departments of Dermatology, Wake Forest School of Medicine, Winston-Salem, NC, USA smoradit@wakehealth.edu.
authors.forename: Sara
authors.initials: S
authors.lastname: Moradi Tuchayi
authors.affiliation: Center for Dermatology Research, Departments of Dermatology, Wake Forest School of Medicine, Winston-Salem, NC, USA.
authors.forename: Hossein
authors.initials: H
authors.lastname: Alinia
authors.affiliation: Center for Dermatology Research, Departments of Dermatology, Wake Forest School of Medicine, Winston-Salem, NC, USA Departments of Pathology and Wake Forest School of Medicine, Winston-Salem, NC, USA Departments of Public Health Sciences, Wake Forest School of Medicine, Winston-Salem, NC, USA.
authors.forename: Steven R
authors.initials: SR
authors.lastname: Feldman
mesh_terms: D000152:Acne Vulgaris / Q000188:drug therapy*; D000279:Administration, Cutaneous; D003879:Dermatologic Agents / Q000008:administration & dosage* / Q000009:adverse effects*; D006801:Humans; D012176:Retinoids / Q000008:administration & dosage* / Q000009:adverse effects*
chemical_list: D003879:Dermatologic Agents; D012176:Retinoids
keywords: adapalene; cutaneous irritation; tazarotene; tretinoin