These active substances include antiarrhythmics (amiodarone, bepridil, quinidine), antihistamines (astemizole, terfenadine), ergot derivatives (dihydroergotamine, ergonovine, ergotamine, methylergonovine), gastointestinal motility agents (cisapride), neuroleptics (pimozide, sertindole) and sedatives/ hypnotics (triazolam) (see section 4.3).