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• W2111990384 abstract "Background This study was conducted to determine whether increased body mass index (BMI) affects oral contraceptive (OC) pharmacokinetics and suppression of hypothalamic���pituitary���ovarian (HPO) axis activity. Study Design Ovulatory reproductive-age women with normal weight (BMI <25 kg/m2; n=10) and with obesity (BMI >30 kg/m2; n=10) received OCs for two cycles (prospective cohort). Subjects were admitted for two 48-h inpatient stays at the beginning and end of the hormone-free interval. Ethinyl estradiol and levonorgestrel (LNG) levels were evaluated during both inpatient stays. Gonadotropin pulsatility (follicle-stimulating hormone and luteinizing hormone) was measured during the second inpatient stay. Estradiol (E2) and progesterone (P) were measured daily during inpatient stays and twice per week in Cycle 2. Results BMI was greater in the obese compared to the normal-BMI group [37.3 kg/m2 (SD, 6.0) vs. 21.9 kg/m2 (SD, 1.6); p<.05]. The LNG half-life was significantly longer in the obese group (52.1��29.4 vs. 25.6��9.3 h, p<.05), which correlated with a lower maximum LNG concentration on Cycle 2, Day 1 [1.9 ng/mL (SD, 0.5) vs. 2.5 ng/mL (SD, 0.7)] and a longer time to reach steady state (10 vs. 5 days) in obese women. There were no significant differences in volume of distribution between groups. LH pulse parameters did not differ statistically between groups but trended toward greater HPO activity in the obese group. Additionally, more obese (6/10 vs. 3/10 normal BMI, p>.05) women exhibited E2 levels consistent with development of a dominant follicle and P levels consistent with ovulation (2/10 vs. 1/10) during Cycle 2. Conclusions Compared to women with normal BMI, obese women exhibit differences in OC pharmacokinetics that are associated with greater HPO activity." @default.
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• W2111990384 date "2009-08-01" @default.
• W2111990384 modified "2023-10-14" @default.
• W2111990384 title "Impact of obesity on oral contraceptive pharmacokinetics and hypothalamic–pituitary–ovarian activity" @default.
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• W2111990384 doi "https://doi.org/10.1016/j.contraception.2009.04.011" @default.
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