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- Nancy A Johnston, Jeremiah R Bieszczak, Steven Verhulst, Kimberly E Disney, Kyle E Montgomery, and Linda A Toth.
- Department of Pharmacology, Southern Illinois University School of Medicine, Springfield, Illinois, USA. njohnston@siumed.edu
- J Am Assoc Lab Anim. 2006 Nov 1; 45 (6): 35-9.
AbstractFenbendazole is commonly used in laboratory animal medicine as an anthelmintic for elimination of pinworms. It is generally regarded as a safe drug with minimal side effects. In our facility, 2 breeding colonies of rats were treated with fenbendazole to eliminate pinworms. Analysis of the breeding records revealed that feeding Sprague-Dawley rats a diet containing fenbendazole on a continuous basis for 7 consecutive weeks was associated with a significant reduction in litter size. Although the mechanism underlying this effect is unknown, the finding prompts caution when using fenbendazole to treat valuable breeding colonies or strains that are poor breeders.
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