A Retrospective Report of Carprofen Administration as Post-Operative Analgesia Reveals Negative Effects of Recommended Doses

Abstract

Ensuring proper pain relief in laboratory animals is vital for their welfare and for obtaining accurate scientific results. Our findings come from examining data collected during routine neuroscientific experiments on rats, where carprofen, a commonly used analgesic, was administered after brain surgery along with other drugs. We noticed that when carprofen was administered twice daily, some rats showed serious side effects, such as reduced eating and drinking, bloating, and signs similar to a severe condition called peritonitis. Further examination revealed blocked intestines and ulcers in these rats. However, when the dosage was reduced to once a day, these side effects did not occur. These observations are based on data from different experimental groups that were not initially designed to test carprofen’s safety. While these results were likely influenced by the combination of surgeries and other treatments, they suggest that less frequent use of carprofen may be safer. We hope these findings will help improve pain management in laboratory animals and encourage further research to refine care protocols.