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- W2072430574 abstract "The aim of the present study was to determine the effect of sulfaphenazole (SP) on the pharmacokinetics of ampiroxicam (AM) which is metabolized by cytochrome P-450 (CYP) 2C9, since SP is a potent inhibitor of CYP2C9, and so a dramatic pharmacokinetic drug interaction between both drugs is assumed after dosing. Sihgle intravenous and oral administrations of AM (5 and 7.5 mg/kg piroxicam equivalent, respectively)and SP (80 and 120 mg/kg, respectively) to rats did not significantly alter the elimination kinetics of AM and piroxicam (PX) converted from AM.. When SP was preloaded orally at 2 h before the dosing of AM, and when AM and SP were orally coadministered for 7 d, the elimination of PX from plasma was slightly retarded and the area under the plasma concentration-time curve (AUC) was increased 77 and 53%, respectively, but not significantly, compared with those after AM alone. On the other hand, a significantly devreased metabolic conversion of PX to 5'-hydroxyPX in plasma was observed by these treatments (p<0.05).In order to clarify the mechanism for the interaction, hepatic and intestinal metabolizing enzyme activities, CYP, uridine 5'-diphosphoglucuronyltransferase (UDPGT) and aryl esterase, were assayed after single and multiple oral administrations of AM or AM and SP. The enzyme activities were hardly inhibited by the treatment, indicating that the inhibition of CYP and hydrolytic enzymes by SP was approximately denied. These results suggest that SP does not significantly affect the pharmacokinetics of AM and PX in rats. However, the pharmacokinetic drug interaction between both drugs in man may not always be ignored." @default.
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- W2072430574 date "1999-01-01" @default.
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- W2072430574 title "Pharmacokinetic Drug Interactions between Ampiroxicam and Sulfaphenazole in Rats." @default.
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- W2072430574 doi "https://doi.org/10.1248/bpb.22.191" @default.
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