Does anyone here know of any unfortunate side effects between St. John's Wort and the common antidepressants?

Currently, I am taking Effexor (Venlafaxine) and find that St. John's Wort seems to also help at times. My doctor seemed to be unaware of even the side effects listed on the Medication Page of this website, so he seems unconcerned. But I would like to hear from other perspectives.

Thanks in advance.