title: Recurring déjà vu associated with 5-hydroxytryptophan.
abstract: BACKGROUND
  Déjà vu occurs both in normal experience and as a neuropsychiatric symptom. Its pathogenesis is partially understood. We describe an iatrogenic case with implications for the neuropharmacological basis of déjà vu.
  
  
  METHODS
  A 42-year-old woman received 5-hydroxytryptophan, in combination with carbidopa, as treatment for palatal tremor, on two occasions, separated by 1 week. On each occasion, she experienced intense, protracted déjà vu, lasting for several hours. We discuss her case in relation to the neuroanatomical and neuropharmacological basis of déjà vu.
  
  
  CONCLUSIONS
  The serotonergic system is involved in the genesis of déjà vu.
authors.affiliation: 1Department of Neurology, Newcastle General Hospital, Newcastle, UK.
authors.forename: Seema
authors.initials: S
authors.lastname: Kalra
authors.affiliation: 2Department of Neurology, Bay of Plenty District Health Board, Tauranga, New Zealand.
authors.forename: Andrew
authors.initials: A
authors.lastname: Chancellor
authors.affiliation: 3Cognitive and Behavioural Neurology Research Group, Peninsula Medical School, Mardon Centre, Exeter, UK.
authors.forename: Adam
authors.initials: A
authors.lastname: Zeman