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Combination therapy is opted as a potential therapeutic strategy for cancer treatment.  Astragalus membranaceus  combined with pemetrexed disodium or gemcitabine could reinforce the overall effects and alleviate the adverse effects. To investigate the effects of  Astragalus membranaceus  on the pharmacokinetics of pemetrexed disodium and gemcitabine, a HPLC method for simultaneous determination of pemetrexed disodium and gemcitabine in rat plasma was developed and validated. Chromatographic separation was achieved on a C18 column using a gradient mode containing water (containing 20 mM NaH 2 PO 4  and 0.1% FA) and methanol at a flow rate of 0.8 mL/min. The specificity, linearity, recovery, stability, precision, and accuracy of the HPLC method were all validated. The rats were pretreated with  Astragalus  extract at the dosage of 3 g/kg for 20 consecutive days until we commence studying the pharmacokinetics of pemetrexed disodium or gemcitabine. There were no significant differences in pharmacokinetic parameters of pemetrexed disodium between the  Astragalus  extract treatment group and the control group. However, AUC, MRT, and Cl of gemcitabine were changed dramatically after treating with  Astragalus  extract ( p  < 0.05). The AUC (0− t ) , AUC (0− ∞ ) , and MRT of gemcitabine decreased from 15747.12 ± 497.11 to 12312.41 ± 594.21 mg/L·min, 15976.18 ± 511.33 to 12489.59 ± 682.01 mg/L·min, and 97.83 ± 5.82 to 84.37 ± 2.79 min, respectively. The Cl of gemcitabine increased from 0.019 ± 0.0067 to 0.024 ± 0.0013 L/min/kg. The results showed that the pretreatment of  Astragalus  extract could exert an influence on the pharmacokinetic characteristics of gemcitabine in rats.

journal of analytical methods in chemistry

Evaluation of the Effects of <i>Astragalus membranaceus</i> on the Pharmacokinetics of Pemetrexed Disodium and Gemcitabine in Rats by a Simple High-Performance Liquid Chromatography/UV Method

Evaluation of the Effects of Astragalus membranaceus on the Pharmacokinetics of Pemetrexed Disodium and Gemcitabine in Rats by a Simple High-Performance Liquid Chromatography/UV Method