Figure 1: Chromatograms obtained from a representative patient on voriconazole therapy. The peaks of voriconazole (trough level of 0.2 μg/mL) and internal standard clonazepam were monitored at 256 nm (solid line) and 310 nm (dot line), respectively. The retention times of internal standard clonazepam and voriconazole were ~5.76 and ~7.45 min, respectively.