title: alpha-Fluoromethylhistidine but not diphenhydramine prevents motion-induced emesis in the cat.
abstract: OBJECTIVE
  This study seeks to evaluate the comparative role of alpha-fluoromethylhistidine and diphenhydramine in the prevention of motion sickness.
  
  
  METHODS
  The role of histaminergic mechanisms in motion sickness were evaluated in a feline model. Twenty-six female cats were studied. A variety of doses of fluoromethylhistidine and diphenhydramine were administered before motion testing.
  
  
  RESULTS
  Fluoromethylhistidine was effective in preventing motion sickness. The efficacy was dose dependent. In contrast, diphenhydramine failed to prevent motion sickness in any of the tested doses.
  
  
  CONCLUSIONS
  The failure of diphenhydramine to prevent motion sickness was unexpected. This may reflect the route of administration or the animal model studied. Depletion of histamine with fluoromethylhistidine prevented motion sickness in cats. Our results suggest that this drug may provide a very long duration of protection in cats.
authors.affiliation: Department of Pharmacology, Wright State University, Dayton, OH 45435.
authors.forename: J B
authors.initials: JB
authors.lastname: Lucot
authors.forename: N
authors.initials: N
authors.lastname: Takeda
mesh_terms: D000818:Animals; D000932:Antiemetics / Q000008:administration & dosage / Q000627:therapeutic use*; D002415:Cats; D004155:Diphenhydramine / Q000008:administration & dosage / Q000627:therapeutic use*; D005260:Female; D008762:Methylhistidines / Q000008:administration & dosage / Q000627:therapeutic use*; D009041:Motion Sickness / Q000517:prevention & control*; D014839:Vomiting / Q000517:prevention & control*
chemical_list: D000932:Antiemetics; D008762:Methylhistidines; C028309:alpha-fluoromethylhistidine; D004155:Diphenhydramine