Can St. John's wort weaken the effectiveness of the contraceptive spiral?

St. John's wort extract may weaken the effect of hormonal methods of contraception, which include hormonal contraceptive spirals. For this reason, in the case of using St. John's wort extracts by people using hormonal methods of contraception, it is recommended to use an additional, mechanical method of contraception (eg condom) during and for at least 2 weeks after short-term and 4 weeks after long-term (longer than 4 weeks) use of preparations containing St. John's wort extract. Below are links to compare prices and purchase sample preparations containing St. John's wort extract on-line: https://www.gdziepolek.pl/produkty/38077/intractum-hyperici-phytopharm-plyn/apteki https://www.gdziepolek.pl/produkty/106927/depremin-tabletki-powlekane/apteki You can read more about the use of St. John's wort extracts in the text: https://www.gdziepolek.pl/substancje/dziurawiec-zwyczajny Below is also a text in which you can Read about what drugs weaken the effect of contraception: https://www.gdziepolek.pl/artykuly/jakie-leki-oslabiaja-skutecznosc-antykoncepcji