Summary
The effect of cigarette smoke exposure on the pharmacokinetics of indomethacin administered orally, intravenously or intrarectally was investigated in rats. When cirgarette smoke exposure was performed for 10 min using a Hamburg II smoking machine immediately after the oral administration of indomethacin (5 mg/kg), the plasma indomethacin concentration was significantly lowered during the first 2 h after administration. However, there was no significant difference in plasma indomethacin concentration between the cigarette smoke-exposed and nonexposed control rats thereafter. Cigarette smoke exposure caused a significant decrease in the area under the concentration-time curve from 0 to 4 h (AUC0–4) and a prolongation of the time to reach the maximum concentration (tmax). The plasma level of O-desmethyl-indomethacin (a major metabolite) was not significantly changed by cigarette smoke. When indomethacin (5 mg/kg) was administered to rats intravenously or intrarectally, cigarette smoke exposure did not have any influence on the pharmacokinetics of indomethacin or 0-desmethyl-indomethacin. The pharmacokinetic effect of cigarette smoke on orally administered indomethacin was mimicked by the subcutaneous injection of nicotine at 0.3 mg/kg but not at 0.1 mg/kg. These results suggest that acute exposure to cigarette smoke decreases the plasma concentration of indomethacin when it is administered orally but not intrarectally or intravenously.
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Yoshida, T., Gomita, Y. & Oishil, R. Effect of cigarette smoke on pharmacokinetics of oral, intrarectal, or intravenous indomethacin in rats. Naunyn-Schmiedeberg's Arch Pharmacol 344, 500–504 (1991). https://doi.org/10.1007/BF00172592
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DOI: https://doi.org/10.1007/BF00172592