John’ s Wort – a herbal product used to treat depression and other conditions (also known as Hypericum perforatum); • midazolam – used to relieve anxiety before surgery; • warfarin – used to treat blood coagulation disorders (such as blood clots or thromboses); • astemizole, terfenadine, cisapride, pimozide, quinidine, bepridil or ergot alkaloids (ergotamine, dihydroergotamine); • antacids, H2 blockers, proton pump inhibitors – used to suppress stomach acidity.