A study was undertaken to assess the hepatotoxic and nephrotoxic potential of ketoprofen in comparison with diclofenac upon short-term intramuscular (i.m.) administration in broiler chickens. Eighteen broiler chickens were randomly divided into 3 groups of 6 birds each. Group I served as the control and received normal saline (0.1 mL, i.m.), group II was the positive control and received diclofenac sodium (2.5 mg/kg, i.m.), and group III received ketoprofen (3 mg/kg, i.m.) daily at 24-h intervals for 5 consecutive days. Diclofenac sodium-treated birds showed severe clinical signs of toxicity with high mortality, a significant increase (P < 0.01) in serum concentrations of creatinine, uric acid, alanine aminotransferase, and aspartate aminotransferase, and these changes correlated well with gross and microscopic examination findings of kidney and liver. In contrast, ketoprofen-treated birds did not show any adverse clinical signs and no significant increase in concentration of creatinine, uric acid, alanine aminotransferase, and aspartate aminotransferase when compared with birds in group I. Gross and microscopic examination of kidney and liver showed normal organ architecture. Thus, based on the present findings, it was concluded that ketoprofen at the dose of 3 mg/kg administered intramuscularly daily for 5 d was nontoxic to broiler chickens.