Hello, i began to take st johns wort for 5 days and then stopped .. how long does it stay in my system after that length of time of taking the tablet ?

St Johns Wort: has not been formally studied by the FDA. Avoid taking serotonergic agents for the next 48 hours to be on the safe side.

The active ingre-: dients in St. John's Wort have a half-life of anywhere between 15 and 60 hours, depending upon how fast you metabolize it, dose, etc., To be safe, give it a week before starting anything else. If you have doubts, call a pharmacist. They know more about drugs and interactions than anyone else--that's their specialty.