title: Two cases of "cannabis acute psychosis" following the administration of oral cannabis.
abstract: BACKGROUND
  Cannabis is the most commonly used illegal drug and its therapeutic aspects have a growing interest. Short-term psychotic reactions have been described but not clearly with synthetic oral THC, especially in occasional users.
  
  
  METHODS
  We report two cases of healthy subjects who were occasional but regular cannabis users without psychiatric history who developed transient psychotic symptoms (depersonalization, paranoid feelings and derealisation) following oral administration of cannabis. In contrast to most other case reports where circumstances and blood concentrations are unknown, the two cases reported here happened under experimental conditions with all subjects negative for cannabis, opiates, amphetamines, cocaine, benzodiazepines and alcohol, and therefore the ingested dose, the time-events of effects on behavior and performance as well as the cannabinoid blood levels were documented.
  
  
  CONCLUSIONS
  While the oral route of administration achieves only limited blood concentrations, significant psychotic reactions may occur.
authors.affiliation: Unité de Médecine du Trafic, Institut Universitaire de Médecine Légale, 1005 Lausanne, Switzerland. bernard.favrat@hospvd.ch
authors.forename: Bernard
authors.initials: B
authors.lastname: Favrat
authors.forename: Annick
authors.initials: A
authors.lastname: Ménétrey
authors.forename: Marc
authors.initials: M
authors.lastname: Augsburger
authors.forename: Laura E
authors.initials: LE
authors.lastname: Rothuizen
authors.forename: Monique
authors.initials: M
authors.lastname: Appenzeller
authors.forename: Thierry
authors.initials: T
authors.lastname: Buclin
authors.forename: Marie
authors.initials: M
authors.lastname: Pin
authors.forename: Patrice
authors.initials: P
authors.lastname: Mangin
authors.forename: Christian
authors.initials: C
authors.lastname: Giroud
mesh_terms: D000208:Acute Disease; D000284:Administration, Oral; D000328:Adult; D003861:Depersonalization / Q000139:chemically induced; D013759:Dronabinol / Q000008:administration & dosage / Q000097:blood / Q000494:pharmacology*; D006213:Hallucinogens / Q000008:administration & dosage / Q000097:blood / Q000494:pharmacology*; D006801:Humans; D008297:Male; D002189:Marijuana Abuse / Q000097:blood / Q000209:etiology*; D008385:Marijuana Smoking / Q000453:epidemiology / Q000523:psychology; D010259:Paranoid Disorders / Q000139:chemically induced; D011605:Psychoses, Substance-Induced / Q000097:blood / Q000209:etiology*
chemical_list: D006213:Hallucinogens; D013759:Dronabinol