Pharmacokinetic interactions between the hormonal emergency contraception, levonorgestrel (Plan B), and Efavirenz.

Pharmacokinetic interactions between the hormonal emergency contraception, levonorgestrel (Plan B), and Efavirenz.
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DOI:
10.1155/2012/137192
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发表时间:
2012
影响因子:
--
通讯作者:
Cu-Uvin S
Cu-Uvin S
中科院分区:
其他
文献类型:
--
作者:
Carten ML;Kiser JJ;Kwara A;Mawhinney S;Cu-Uvin S

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目标。比较使用依非韦伦 (EFV) 之前和使用依非韦伦 (EFV) 时的 B 计划左炔诺孕酮 (LNG) 浓度-时间曲线下面积 (AUC12)。设计。前瞻性、开放标签、单臂、等效性研究。方法。健康的 HIV 阴性受试者在单剂量 LNG 后和 EFV 14 天后接受 12 小时强化药代动力学 (PK) 采样。报告 PK 参数的几何平均值、几何平均值比率和 90% 置信区间 (CI)。使用 T 检验。评估临床参数和肝功能测试(LFT)。结果。 24 名女性入组,其中 21 名完成了研究。使用 EFV,LNG AUC12 从 42.9 降低至 17.8ng*hr/mL,降低了 56%(95% CI:49%、62%),最大浓度(Cmax⁡)从 8.4 降低至 4.6ng/mL,降低了 41%(95% CI:33%、50%)。 LNG 耐受性良好,没有 3 级或 4 级治疗相关毒性。结论。 EFV 显着减少了液化天然气暴露。 EFV 可能需要更高的液化天然气剂量。这些结果强调了服用 EFV 的女性有效避孕的重要性。
Objectives. Compare the Plan B levonorgestrel (LNG) area under the concentration- time curve (AUC12) prior to and with efavirenz (EFV). Design. Prospective, open-label, single-arm, equivalence study. Methods. Healthy HIV-negative subjects underwent 12 hr intensive pharmacokinetic (PK) sampling following single dose LNG alone and after 14 days of EFV. Geometric means, Geometric Mean Ratios, and 90% confidence intervals (CI) are reported for PK Parameters. T-tests were utilized. Clinical parameters and liver function tests (LFTs) were assessed. Results. 24 women enrolled and 21 completed the study. With EFV, LNG AUC12 was reduced 56% (95% CI: 49%, 62%) from 42.9 to 17.8 ng∗hr/mL, and maximum concentration (Cmax⁡) was reduced 41% (95% CI: 33%, 50%) from 8.4 to 4.6 ng/mL. LNG was well tolerated with no grade 3 or 4 treatment-related toxicities. Conclusions. EFV significantly reduced LNG exposures. Higher LNG doses may be required with EFV. These results reinforce the importance of effective contraception in women taking EFV.