Co-administration may result in competitive inhibition of the metabolism of these medicinal products and create the potential for serious and/ or life-threatening adverse events such as cardiac arrhythmia (e. g. amiodarone, bepridil, quinidine, terfenadine, astemizole, cisapride, pimozide), respiratory depression and / or prolonged sedation (e. g. oral triazolam and oral midazolam (for caution on parenterally administered midazolam, see section 4.5)) or peripheral vasospasm or ischaemia and ischaemia of other tissues, including cerebral or myocardial ischaemia (e. g. ergot derivatives).