Yes, St Johns wort: Can decrease effectiveness of bcp. Don't worry, be happy! http://wiki.Answers.Com/q/does_st._john%27s_wort_affect_the_birth_control_pill#page1.
Answered 12/9/2013
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Yes: Yes, st. John's wort induces the liver enzymes that metabolize a number of medications, including birth control pills. If you use both of these, best to use another birth control method.
Answered 9/20/2016
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