, Volume 25, Issue 8, pp 1807-1814
Date: 31 Jan 2008

Effect of Silymarin Supplement on the Pharmacokinetics of Rosuvastatin

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Abstract

Objectives

To evaluate the effect of silymarin on the pharmacokinetics of rosuvastatin in systems overexpressing OATP1B1 or BCRP transporters and in healthy subjects.

Materials and Methods

The concentration-dependent transport of rosuvastatin and the inhibitory effect of silymarin were examined in vitro in OATP1B1-expressing oocytes and MDCKII-BCRP cells. For in vivo assessment, eight healthy male volunteers, divided into two groups, were randomly assigned to receive placebo or silymarin (140 mg) three times per day for 5 days. On day 4, all subjects received rosuvastatin (10 mg, 8 am) 1 h after the placebo or silymarin administration. A series of blood samples were collected for 72 h, and the plasma concentration of rosuvastatin was determined using LC-MS/MS.

Results

Based on the concentration dependency of rosuvastatin transport in the OATP1B1 and BCRP overexpression systems, rosuvastatin is a substrate for both transporters. Silymarin inhibited both OATP1B1- and BCRP-mediated rosuvastatin transport in vitro (K i 0.93 μM and 97 μM, respectively). However, no significant changes in AUC, half-life, V d/F, or Cl/F of rosuvastatin were observed in human subjects following pretreatment with silymarin.

Conclusions

Silymarin does not appear to affect rosuvastatin pharmacokinetics in vivo, suggesting that silymarin, administered according to a recommended supplementation regimen, is not a potent modulator of OATP1B1 or BCRP in vivo.