The Incivek prescribing informations lists clarithromycin, erythromycin and
telithromycin as antibacterials that can cause drug interaction.
"Concentrations of both telaprevir and the antibacterial may be increased during co-administration. Caution is warranted and clinical monitoring is recommended when co-administered with telaprevir. QT interval prolongation and Torsade de Pointes have been reported with clarithromycin and erythromycin.