title: Effect of rosuvastatin on warfarin pharmacodynamics and pharmacokinetics.
abstract: The effect of rosuvastatin on warfarin pharmacodynamics and pharmacokinetics was assessed in 2 trials. In trial A (a randomized, double-blind, 2-period crossover study), 18 healthy volunteers were given rosuvastatin 40 mg or placebo on demand (o.d.) for 10 days with 1 dose of warfarin 25 mg on day 7. In trial B (an open-label, 2-period study), 7 patients receiving warfarin therapy with stable international normalized ratio values between 2 and 3 were coadministered rosuvastatin 10 mg o.d. for up to 14 days, which increased to rosuvastatin 80 mg if the international normalized ratio values were <3 at the end of this period. The results indicated that rosuvastatin can enhance the anticoagulant effect of warfarin. The mechanism of this drug-drug interaction is unknown. Rosuvastatin had no effect on the total plasma concentrations of the warfarin enantiomers, but the free plasma fractions of the enantiomers were not measured. Appropriate monitoring of the international normalized ratio is indicated when this drug combination is coadministered.
authors: AstraZeneca, 1800 Concord Pike, PO Box 15437, Wilmington, DE 19850-5437, USA.
authors: Steven G
authors: SG
authors: Simonson
authors: Paul D
authors: PD
authors: Martin
authors: Patrick D
authors: PD
authors: Mitchell
authors: Kenneth
authors: K
authors: Lasseter
authors: Gordon
authors: G
authors: Gibson
authors: Dennis W
authors: DW
authors: Schneck
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000925:Anticoagulants / Q000008:administration & dosage / Q000493:pharmacokinetics* / Q000494:pharmacology; D019540:Area Under Curve; D001777:Blood Coagulation / Q000187:drug effects; D018592:Cross-Over Studies; D004311:Double-Blind Method; D004357:Drug Synergism; D005260:Female; D005464:Fluorobenzenes / Q000008:administration & dosage / Q000493:pharmacokinetics / Q000494:pharmacology*; D006207:Half-Life; D006801:Humans; D019161:Hydroxymethylglutaryl-CoA Reductase Inhibitors / Q000008:administration & dosage / Q000493:pharmacokinetics / Q000494:pharmacology*; D019934:International Normalized Ratio; D008297:Male; D008875:Middle Aged; D011743:Pyrimidines / Q000008:administration & dosage / Q000493:pharmacokinetics / Q000494:pharmacology*; D000068718:Rosuvastatin Calcium; D013449:Sulfonamides / Q000008:administration & dosage / Q000493:pharmacokinetics / Q000494:pharmacology*; D014859:Warfarin / Q000008:administration & dosage / Q000493:pharmacokinetics* / Q000494:pharmacology
chemical_list: D000925:Anticoagulants; D005464:Fluorobenzenes; D019161:Hydroxymethylglutaryl-CoA Reductase Inhibitors; D011743:Pyrimidines; D013449:Sulfonamides; D014859:Warfarin; D000068718:Rosuvastatin Calcium