The antiemetic maropitant, with metacresol as preservative (Cerenia, Zoetis), has been associated with pain after subcutaneous injection in dogs and cats. Recently, a generic formulation containing benzyl alcohol was authorised (Prevomax, Le Vet). Benzyl alcohol is reported to have local anaesthetic properties and reduce injection pain. This study compared local pain after subcutaneous injection of the two maropitant formulations, administered at approximately 4°C and 25°C, to dogs. Thirty-two healthy beagle dogs were enrolled into a blinded, randomised, cross-over study. Dogs received subcutaneous injections of maropitant injection containing metacresol as preservative and maropitant injection containing benzyl alcohol as preservative, both at approximately 4°C and 25°C, with at least three days in between treatments. Injection pain was evaluated by two blinded observers using a visual analogue scale immediately after injection and a simple descriptive scale at two minutes after injection. In healthy beagle dogs, subcutaneous injection of maropitant with benzyl alcohol is significantly less painful than injection of maropitant with metacresol.
- pain assessment
- pharmaceutical preservative
- subcutaneous injection
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Contributors ND was involved in the study design, data acquisition, analysis and interpretation, and writing of the manuscript. CAR was involved in the study design, data acquisition, and review and approval of the manuscript. HPV was involved in the study design, and review and approval of the manuscript. NL was involved in the study design, data acquisition, analysis and interpretation, and review and approval of the manuscript.
Funding The study was funded by AST Beheer. The funders had no involvement in the study design, conduct of the study, collection, analysis and interpretation of the data, and the writing of the manuscript.
Competing interests ND, CAR and HPV are employees of Regivet. Regivet has developed the generic maropitant formulation.
Ethics approval The study was approved by the ethical committee as required by the Dutch Act on Animal Experimentation (February 1997).
Provenance and peer review Not commissioned; externally peer reviewed.
Data sharing statement There are no additional unpublished data.
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