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Effectiveness of clopidogrel dose escalation to normalize active metabolite exposure and antiplatelet effects in CYP2C19 poor metabolizers
Author(s) -
Horenstein Richard B.,
Madabushi Rajnikanth,
Zineh Issam,
YergesArmstrong Laura M.,
Peer Cody J.,
Schuck Robert N.,
Figg William Douglas,
Shuldiner Alan R.,
Pacanowski Michael A.
Publication year - 2014
Publication title -
the journal of clinical pharmacology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.92
H-Index - 116
eISSN - 1552-4604
pISSN - 0091-2700
DOI - 10.1002/jcph.293
Subject(s) - cyp2c19 , clopidogrel , metabolite , active metabolite , medicine , pharmacology , pharmacokinetics , crossover study , metabolism , aspirin , alternative medicine , cytochrome p450 , pathology , placebo
Carriers of two copies of the loss‐of‐function CYP2C19*2 variant convert less clopidogrel into its active metabolite, resulting in diminished antiplatelet responses and higher cardiovascular event rates. To evaluate whether increasing the daily clopidogrel dose in poor metabolizers (PM) overcomes the effect of the CYP2C19 * 2 variant, we enrolled 18 healthy participants in a genotype‐stratified, multi‐dose, three‐period, fixed‐sequence crossover study. Six participants with the *1/*1 extensive (EM), *1/*2 intermediate (IM), and *2/*2 poor metabolizer genotypes each received 75 mg, 150 mg, and 300 mg each for 8 days. In each period, maximal platelet aggregation 4 hours post‐dose (MPA4) and active metabolite area under the curve (AUC) differed among genotype groups ( P < .05 for all). At day 8, PMs needed 300 mg daily and IMs needed 150 mg daily to attain a similar MPA4 as EMs on the 75 mg dose (32.6%, 33.2%, 31.3%, respectively). Similarly, PMs needed 300 mg daily to achieve active metabolite concentrations that were similar to EMs on 75 mg (AUC 37.7 and 33.5 ng h/mL, respectively). These results suggest that quadrupling the usual clopidogrel dose might be necessary to overcome the effect of poor CYP2C19 metabolism.