title: Treatment of poison ivy/oak allergic contact dermatitis with an extract of jewelweed.
abstract: BACKGROUND
  Jewelweed (Impatiens biflora) is a plant which has been used for centuries for the treatment of poison ivy/oak allergic contact dermatitis. Numerous claims for its effectiveness exist in the lay press, and over-the-counter medicaments containing jewelweed are reputed to be an effective remedy for poison ivy/oak dermatitis. Despite these claims, few scientific studies testing the effectiveness of jewelweed have been performed.
  
  
  OBJECTIVE
  Our objective in this pilot study was to test the efficacy of an extract of jewelweed in the treatment of experimentally induced allergic contact dermatitis to poison ivy/oak.
  
  
  METHODS
  A randomized, double-blinded, paired comparison investigation was performed. Ten adult volunteers were patch tested to urushiol, the allergenic resin in poison ivy/oak. For each volunteer, one patch test site was treated with an extract prepared from the fresh stems of jewelweed; the remaining site was treated with distilled water to serve as a control. Sites were examined on days 2, 3, 7, and 9 with reactions graded on a numerical scale.
  
  
  RESULTS
  All subjects developed dermatitis at each patch test site. There was no statistically significant difference in the objective scores at the sites treated with jewelweed extract versus the distilled water control sites.
  
  
  CONCLUSIONS
  This study demonstrated that an extract of jewelweed was not effective in the treatment of poison ivy/oak allergic contact dermatitis.
authors.affiliation: Department of Medicine, Pennsylvania State University College of Medicine, Milton S. Hershey Medical Center, Hershey, USA.
authors.forename: D
authors.initials: D
authors.lastname: Long
authors.forename: N H
authors.initials: NH
authors.lastname: Ballentine
authors.forename: J G
authors.initials: JG
authors.lastname: Marks
mesh_terms: D000328:Adult; D000485:Allergens / Q000008:administration & dosage / Q000009:adverse effects; D002396:Catechols / Q000008:administration & dosage / Q000009:adverse effects; D011040:Dermatitis, Toxicodendron / Q000188:drug therapy* / Q000209:etiology; D004311:Double-Blind Method; D004487:Edema / Q000188:drug therapy / Q000209:etiology; D004890:Erythema / Q000188:drug therapy / Q000209:etiology; D005500:Follow-Up Studies; D006801:Humans; D010328:Patch Tests; D010865:Pilot Projects; D010919:Placebos; D010936:Plant Extracts / Q000627:therapeutic use; D010946:Plants, Medicinal; D010947:Plants, Toxic; D011537:Pruritus / Q000188:drug therapy / Q000209:etiology
chemical_list: D000485:Allergens; D002396:Catechols; D010919:Placebos; D010936:Plant Extracts; C003747:urushiol