Should not be taken simultaneously w/ antacids or antisecretory drugs. Possible antagonised anti-dyspeptic effect w/ anticholinergic drugs. Contraindicated w/ QTc-prolonging medicinal drugs eg, anti-arrhythmics class IA (eg, disopyramide, hydroquinidine, quinidine), anti-arrhythmics class III (eg, amiodarone, dofetilide, dronedarone, ibutilide, sotalol), certain antipsychotics (eg, haloperidol, pimozide, sertindole), certain antidepressants (eg, citalopram, escitalopram), certain antibiotics (eg, erythromycin, levofloxacin, moxifloxacin, spiramycin), certain antifungal agents (eg, fluconazole, pentamidine), certain antimalarial agents (in particular halofantrine, lumefantrine), certain GI medicines (eg, cisapride, dolasetron, prucalopride), certain antihistaminics (eg, mequitazine, mizolastine), certain medicines used in cancer (eg, toremifene, vandetanib, vincamine), certain other medicines (eg, bepridil, diphemanil, methadone); apomorphine (unless benefit of co-administration outweighs the risks & recommended precautions are strictly fulfilled); potent CYP3A4 inhibitors eg, PIs (eg, ritonavir, saquinavir, telaprevir), systemic azole antifugals (eg, itraconazole, ketoconazole, posaconazole, voriconazole), certain macrolides (eg, clarithromycin, telithromycin). Not recommended w/ moderate CYP3A4 inhibitors (eg, diltiazem, verapamil & some macrolides). Caution w/ bradycardia & hypokalaemia-inducing drugs, azithromycin & roxithromycin.