title: Adverse effects of aromatherapy: a systematic review of case reports and case series.
abstract: OBJECTIVE
  This systematic review was aimed at critically evaluating the evidence regarding the adverse effects associated with aromatherapy.
  
  
  METHODS
  Five electronic databases were searched to identify all relevant case reports and case series.
  
  
  RESULTS
  Forty two primary reports met our inclusion criteria. In total, 71 patients experienced adverse effects of aromatherapy. Adverse effects ranged from mild to severe and included one fatality. The most common adverse effect was dermatitis. Lavender, peppermint, tea tree oil and ylang-ylang were the most common essential oils responsible for adverse effects.
  
  
  CONCLUSIONS
  Aromatherapy has the potential to cause adverse effects some of which are serious. Their frequency remains unknown. Lack of sufficiently convincing evidence regarding the effectiveness of aromatherapy combined with its potential to cause adverse effects questions the usefulness of this modality in any condition.
authors.affiliation: Complementary Medicine, Peninsula Medical School, Exeter, UK.
authors.forename: Paul
authors.initials: P
authors.lastname: Posadzki
authors.forename: Amani
authors.initials: A
authors.lastname: Alotaibi
authors.forename: Edzard
authors.initials: E
authors.lastname: Ernst
mesh_terms: D019341:Aromatherapy / Q000009:adverse effects*; D016206:Databases, Bibliographic; D003877:Dermatitis, Contact / Q000209:etiology; D006801:Humans; D009822:Oils, Volatile / Q000009:adverse effects*
chemical_list: D009822:Oils, Volatile