Levonorgestrel-containing emergency contraceptives: interaction with hepatic enzyme inducers

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Concurrent use of CYP3A4 enzyme inducers can increase the metabolism of levonorgestrel, which may reduce the contraceptive efficacy of levonorgestrel-containing emergency hormonal contraceptives

Concomitant use of the antiretroviral efavirenz has shown to reduce levonorgestrel plasma levels by arou...