Effects of grapefruit juice on the pharmacokinetics of pitavastatin and atorvastatin.

AIMS: To compare the effects of grapefruit juice (GFJ) on the pharmacokinetics of pitavastatin and atorvastatin. METHODS: In a randomized, four-phase crossover study, eight healthy subjects consumed either GFJ or water t.i.d. for 4 days in each trial. On each final day, a single dose of 4 mg pitavastatin or 20 mg atorvastatin was administered. RESULTS: GFJ increased the mean AUC(0-24) of atorvastatin acid by 83% (95% CI 23-144%) and that of pitavastatin acid by 13% (-3 to 29%). CONCLUSIONS: Pitavastatin, unlike atorvastatin, appears to be scarcely affected by the CYP3A4-mediated metabolism.