Bibliogr. s. 44

The biological action of N-acetyl-p-aminophenol - paracetamol (acetaminophen) has been demonstrated to involve different mechanisms and is still not clear. Hydrogen sulfide (H_{2}S) has been shown to play an important role in many physiological and pathological processes including nociception. The interaction between acetaminophen and endogenous H_{2}S is unknown. Twenty four female CBA strain mice were administered intraperitoneal injections of N-acetyl-p-aminophenol solution: paracetemol in doses of 30 mg/kg b.w. per day (group D1, n = 8) or 100 mg/kg b.w. per day (group D2, n = 8)‥ The control group (n = 8) received physiological saline in portions of the same volume–0.2 ml. The measurements of tissue H_{2}S concentration were performed with the Siegel spectrophotometric modified method. In the brain, the H_{2}S tissue level decreased, but more significantly in the lower drug dose group. Conversely, there was a significant rise in the H_{2}S tissue concentration in D1 and D2 groups in heart and kidney with the increase more pronounced in the group with the lower paracetamol dose. In the liver only the higher acetaminophen dose elicited a change in H_{2}S concentration, increasing after administration of acetaminophen at 100 mg/kg. Our study demonstrates that paracetamol induces H_{2}S tissue concentration changes in different mouse organs.