EFFECTS OF ST JOHN?S WORT ON LEVONORGESTREL/EMERGENCY CONTRACEPTION

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This subproject is one of many research subprojects utilizing the resources provided by a Center grant funded by NIH/NCRR. The subproject and investigator (PI) may have received primary funding from another NIH source, and thus could be represented in other CRISP entries. The institution listed is for the Center, which is not necessarily the institution for the investigator. This study will evaluate the effects of a common herbal remedy, St. John's Wort (Hypericum perforatum), on metabolism of levonorgestrel in a dosing regimen for emergency contraception. Emergency contraception, if taken soon after unprotected intercourse, prevents pregnancy. St. John's Wort induces the P450 enzyme system in the liver, and may cause increased metabolism of contraceptive steroids used as emergency contraception. This will be a randomized, blinded, clinical trial of four groups of reproductive-aged women to assess the potential interaction between St. John's Wort and levonorgestrel.