22. Concomitant use of any drug known to prolong QTc interval (including amiodarone, bepridil, chloroquine, chlorpromazine, cisapride, clarithromycin, disopyramide dofetilide, domperidone, droperidol, erythromycin, halofantrine, haloperidol, ibutilide, levomethadyl, mesoridazine, methadone, pentamidine, pimozide, procainamide, quinidine, sotalol, sparfloxacin, thioridazine). The exception is moxifloxacin which is one of the drugs being evaluated in this study, with extensive ECG monitoring to help ensure patient safety.