Reference
MHRA. St John's wort: interaction with hormonal contraceptives, including implants - reduced contraceptive effect. Drug Safety Update 7: A2, No. 8, 13 Mar 2014. Available from: URL: http://www.mhra.gov.uk/home/groups/dsu/documents/publication/con392897.pdf
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Hormonal contraceptives/St John's wort interaction. Reactions Weekly 1494, 2 (2014). https://doi.org/10.1007/s40278-014-9654-x
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DOI: https://doi.org/10.1007/s40278-014-9654-x