St. John's wort might reduce the effectiveness of oral contraceptives
There are growing concerns that St. John's wort might reduce the effectiveness of oral contraceptives.
So far there are reports of breakthrough bleeding and menstrual irregularities in women who combine St. John's wort and the pill. These are signs of decreased estrogen levels.
St. John's wort appears to induce cytochrome P450 3A4...which increases the metabolism of ethinyl estradiol.
Practical advice for a better career, with unlimited access to CE
Pharmacy Technician's Letter Canada includes:
- 12 issues every year, with brief articles about new meds and hot topics
- 120+ CE courses, including the popular CE-in-the-Letter
- Helpful, in-depth Technician Tutorials
- Access to the entire archive
Already a subscriber? Log in
Volume pricing available. Get a quote