Abstract
Objective To characterize the pharmacokinetics and pharmacogenetics of nifedipine in pregnancy.
Study Design Pregnant women receiving oral nifedipine underwent steady-state pharmacokinetic testing
over one dosing interval. DNA was obtained and genotyped for cytochrome P450 (CYP)
3A5 and CYP3A4*1B. Nifedipine and oxidized nifedipine concentrations were measured in plasma, and pharmacokinetic
parameters were compared between those women who expressed a CYP3A5*1 allele and those who expressed only variant CYP3A5 alleles (*3,*6, or *7).
Results Fourteen women had complete data to analyze. Four women (29%) expressed variant CYP3A5; three of these women were also CYP3A4*1B allele carriers. The mean half-life of nifedipine was 1.68 ± 1.56 hours. The area
under the curve from 0 to 6 hours for the women receiving nifedipine every 6 hours
was 207 ± 138 µg·h /L. Oral clearance was different between high expressers and low
expressers (232.0 ± 37.8 µg/mL versus 85.6 ± 45.0 µg/mL, respectively; p = 0.007).
Conclusion CYP3A5 genotype influences the oral clearance of nifedipine in pregnant women.
Keywords
nifedipine - pharmacokinetics - pharmacogenetics - pregnancy - tocolysis