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| Alterations of Gefitinib Pharmacokinetics by Co-administration of Herbal Medications in Rats |
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| KeyWord:herb-drug interaction, pharmacokinetics, gefitinib, Guipi Decoction, Bawu Decoction |
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| Abstract: |
| Objective: To evaluate the potential pharmacokinetic interactions of the anticancer agent gefitinib (Iressa?) and the oriental medications Guipi Decoction (归脾汤, GPD, Guibi-tang in Korean) and Bawu Decoction (八物汤, BWD, Palmul-tang in Korean). Methods: Methylcellulose (MC, control), GPD (1,200 mg/kg), or BWD(6,000 mg/kg) was orally administered to rats either as a single dose or multiple doses prior to gefitinib administration. To examine the effects of a single dose of the herbal medicines, gefitinib (10 mg/kg) was orally administered after 5 min or 1 h of MC or the herbal medicine pretreatments. To examine the effects of the multiple doses of the herbal medicines, gefitinib (10 mg/kg) was orally administered following 7 consecutive days of the administration of MC or each herbal medicine. The plasma concentrations of gefitinib were determined with liquid chromatography-tandem mass spectrometry assay. The plasma concentration-time profiles of gefitinib were analyzed with a noncompartmental analysis. Results: Gefitinib was rapidly absorbed and showed a mono-exponential decline with an elimination half-life of 3.7–4.1 h. The pharmacokinetics of gefitinib was not affected by GPD pretreatment. However, a significantly lower maximum plasma concentration (Cmax, P<0.05) and area under the curve (P<0.05), and a delayed time to reach Cmax (Tmax, P<0.01) were observed in both single- and multiple-dose BWD-pretreated rats compared with the control rats. Conclusions: BWD and not GPD might delay and interfere with gefitinib absorption. Further evaluations of the clinical significance of these findings are needed. |
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