Carprofen is a non-steroidal anti-inflammatory drug (NSAID) that has been found to have antimicrobial activity. Carprofen is primarily used as a veterinary analgesic and anti-inflammatory for arthritis and pain. Its anti-inflammatory activity is due to cyclooxygenase inihbition with selectivity for COX-2 inhibition, while its antimicrobial activity is less certain. Carprofen can kill B. subtilis by permeabilizing its membrane. Other studies have shown carprofen can target the Escherichia coli DNA polymerase III β subunit.