Dr Littlejohn Told His Patient Not to Take St

 Dr. Littlejohn told his patient not to take St. John's wort with her other medications because not a lot is known about the herb and it might _____.

A) increase the effectiveness of other medications she is taking
B) decrease the effectiveness of other medications she is taking
C) prevent the reuptake of serotonin
D) Raise her blood pressure after she eats tyramine-rich food