Muligheden for, at mere potente hæmmere af CYP3A4 dvs. ketoconazol, itraconazol, ritonavir) kan øge plasmakoncentrationen af amlodipin i større omfang end diltiazem kan ikke udelukkes.
The possibility that more potent inhibitors of CYP3A4 (i. e. ketoconazole, itraconazole, ritonavir) may increase the plasma concentration of amlodipine to a greater extent than diltiazem cannot be excluded.