Rifampicin alters atorvastatin plasma concentration on the basis of SLCO1B1 521T>C polymorphism

Clin Chim Acta. 2009 Jul;405(1-2):49-52. doi: 10.1016/j.cca.2009.04.003. Epub 2009 Apr 14.


Background: Both atorvastatin and rifampicin are substrates of OATP1B1 (organic anion transporting polypeptide 1B1) encoded by SLCO1B1 gene. Rifampicin is a potent inhibitor of SLCO1B1 (IC50 1.5 umol/l) and SLCO1B1 521T>C functional genetic polymorphism alters the kinetics of atorvastatin in vivo. We hypothesize that rifampicin might influence atorvastatin kinetics in a SLCO1B1 polymorphism dependent manner.

Methods: Sixteen subjects with known SLCO1B1 genotypes (6 c.521TT, 6 c.521TC and 4 c.521CC) were divided into 2 groups (atorvastatin-placebo group, n=8; atorvastatin-rifampicin group, n=8) randomly. In this 2-phase crossover study, atorvastatin (40 mg single-oral dose) pharmacokinetics after co-administration of placebo and rifampicin (600 mg single-oral dose) were measured for up to 48 h by liquid chromatography-mass spectrometry (LC-MS). In the third phase, rifampicin (450 mg single-oral dose) pharmacokinetics was measured additionally.

Results: Rifampicin increased atorvastatin plasma concentration in accordance with SLCO1B1 521T>C genotype while the increasing percentage of AUC((0-48)) among c.521TT, c.521TC and c.521CC individuals were 833+/-245% vs 468+/-233% vs 330+/-223% (P=0.007). However, SLCO1B1 521T>C exerted no impact on rifampicin pharmacokinetics (P>0.05).

Conclusions: These results suggested that rifampicin elevated the plasma concentration of atorvastatin depending on SLCO1B1 genotype and rifampicin pharmacokinetics were not altered by SLCO1B1 genotype.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Atorvastatin
  • Genotype
  • Heptanoic Acids / blood*
  • Humans
  • Kinetics
  • Liver-Specific Organic Anion Transporter 1
  • Male
  • Organic Anion Transporters / genetics*
  • Organic Anion Transporters / metabolism*
  • Polymorphism, Genetic / genetics*
  • Pyrroles / blood*
  • Rifampin / blood*
  • Rifampin / pharmacokinetics
  • Thymidine / genetics
  • Thymidine / metabolism
  • Young Adult


  • Heptanoic Acids
  • Liver-Specific Organic Anion Transporter 1
  • Organic Anion Transporters
  • Pyrroles
  • SLCO1B1 protein, human
  • Atorvastatin
  • Thymidine
  • Rifampin