No relevant interaction with alprazolam, caffeine, tolbutamide, and digoxin by treatment with a low-hyperforin St John’s wort extract - Arold,G.; Donath,F.; Maurer,A.; Diefenbach,K.; Bauer,S.; Henneicke-von Zepelin,H.H.; Friede,M.; Roots,I. (Planta Med, 2005)