Abstract Background Nonsteroidal anti-inflammatory drugs (NSAIDs) are generally used to reduce pain in different diseases acting as anti-inflammatory, antipyretic, and analgesic. Paracetamol is a nonprescription drug extremely used for antipyresis and analgesia. In spite of their beneficial effects, NSAIDs have been notified to be linked with some adverse effects. The present study was conducted to elucidate the comparative biochemical and immunological changes in mice treated with diclofenac (Diclo), ibuprofen (Ibu), or paracetamol (Para). Methods Swiss albino mice were divided uniformly into seven different groups. Mice were intraperitoneally (i.p.) administered with Diclo (7.4 and 14.8 mg/kg), Ibu (60 and 120 mg/kg), and Para (36.7 and 7...