Cancer Treatment Side Effects & Supportive and Palliative Care
St. John's Wort
FAQs
Do I need to let my doctor know that I am taking St. John's Wort?
St. John's Wort may interfere with chemotherapy by affecting the way your liver processes chemotherapy drugs. Therefore, it is advisable that you do not take St. John's Wort unless your physician has recommended it.
How long should I take it to see an effect?
You will usually need to take St. John's Wort for 2-6 weeks to see an effect.