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