Pharmacokinetics of caffeine during and after pregnancy.

The pharmacokinetic parameters of caffeine were measured in 9 pregnant women and 4 women 4 days post partum. The results show a significant prolongation of caffeine elimination in pregnant women. Normal pharmacokinetic parameters seem to be restored as soon as 4 days post partum. Steroids hormones (estriol, estradiol, and progesterone) were measured in both cases.