title: [Photodermatosis induced by hydroxychloroquine: 4 cases].
abstract: BACKGROUND
  Hydroxychloroquine is an antimalarial drug often used in dermatology for its photo-protective effects. Four cases of photodermatosis induced by hydroxychloroquine are reported.
  
  
  METHODS
  Four patients, aged from 21 to 68 years, developed a photolocalized eruption from 6 days to 10 weeks after starting hydroxychloroquine. The minimal erythemal dose was decreased in the total spectra and UVA at the onset of the eruption and became normal after stopping hydroxychloroquine in the 2 patients that were controlled. In 3 cases, hydroxychloroquine was the only single drug imputable; chronological imputability was plausible. In the last case, both hydroxychloroquine, carbamazepine and fluvoxamine had a common imputability which was plausible. In the 4 cases, a favourable outcome was observed after stopping hydroxychloroquine, and no recurrence occurred with a mean follow-up of 3.8 years (1-4 years). In one case, a photodistributed eruption occurred during treatment with a related molecule: chloroquine.
  
  
  CONCLUSIONS
  Photodermatosis with hydroxychloroquine have rarely been described in the literature, while quinine from which hydroxychloroquine is derived, is well known for its risk of photosensibilization. The main differential diagnosis of these drug eruptions is an eruption caused by the photodermatosis that initially required treatment with hydroxychloroquine.
authors.affiliation: Clinique Dermatologique, Hôpital Charles Nicole, 1, rue de Germont, 76031 Rouen Cedex.
authors.forename: I
authors.initials: I
authors.lastname: Métayer
authors.forename: X
authors.initials: X
authors.lastname: Balguerie
authors.forename: P
authors.initials: P
authors.lastname: Courville
authors.forename: P
authors.initials: P
authors.lastname: Lauret
authors.forename: P
authors.initials: P
authors.lastname: Joly
mesh_terms: D000328:Adult; D000368:Aged; D004305:Dose-Response Relationship, Drug; D003875:Drug Eruptions / Q000175:diagnosis* / Q000473:pathology; D005260:Female; D006801:Humans; D006886:Hydroxychloroquine / Q000008:administration & dosage / Q000009:adverse effects*; D008297:Male; D008875:Middle Aged; D010787:Photosensitivity Disorders / Q000139:chemically induced* / Q000175:diagnosis / Q000473:pathology; D012867:Skin / Q000187:drug effects / Q000473:pathology; D014466:Ultraviolet Rays / Q000009:adverse effects
chemical_list: D006886:Hydroxychloroquine