title: Evaluation of diphenhydramine as a sedative for dogs.
abstract: OBJECTIVE
  To determine and compare levels of sedation achieved by IM administration of diphenhydramine, saline (0.9% NaCl) solution, and acepromazine in dogs.
  
  
  METHODS
  Prospective randomized study.
  
  
  METHODS
  56 dogs.
  
  
  METHODS
  Dogs were randomly assigned to receive diphenhydramine at 2, 4, or 8 mg/kg (0.9, 1.8, or 3.6 mg/lb, respectively) i.m.; acepromazine at 0.1 mg/kg (0.05 mg/lb) i.m.; or saline solution at 0.05 mL/kg (0.02 mL/lb) i.m. Sedation was assessed by use of a 6-category descriptive system based on observation and interaction.
  
  
  RESULTS
  Dogs in the acepromazine group had significantly higher sedation scores than did dogs in the saline solution or diphenhydramine groups at 30 minutes. Dogs in the diphenhydramine groups did not have significantly different sedation scores from dogs in the saline solution group at any time point.
  
  
  CONCLUSIONS
  Diphenhydramine did not cause clinically appreciable sedation in healthy dogs. Diphenhydramine is not suitable as a sole sedative prior to general anesthesia in dogs.
authors.affiliation: Department of Small Animal Medicine and Surgery, College of Veterinary Medicine, University of Georgia, Athens, GA 30602, USA.
authors.forename: Erik H
authors.initials: EH
authors.lastname: Hofmeister
authors.forename: Christine M
authors.initials: CM
authors.lastname: Egger
mesh_terms: D000075:Acepromazine / Q000008:administration & dosage; D000818:Animals; D004155:Diphenhydramine / Q000008:administration & dosage*; D004285:Dogs / Q000502:physiology*; D004305:Dose-Response Relationship, Drug; D006993:Hypnotics and Sedatives / Q000008:administration & dosage*; D007273:Injections, Intramuscular / Q000662:veterinary; D011446:Prospective Studies; D011897:Random Allocation; D013997:Time Factors
chemical_list: D006993:Hypnotics and Sedatives; D000075:Acepromazine; D004155:Diphenhydramine