Twelve patients chronically maintained on warfarin were administered 8
0 mg atorvastatin for 2 weeks. Mean prothrombin times decreased slight
ly, but only for the first few days of the two-week treatment period.
Thus atorvastatin had no consistent effect on the anticoagulant activi
ty of warfarin and adjustments in warfarin dosing should not be necess
ary.