Voriconazole has a narrow therapeutic window and nonlinear pharmacokinetic profile with wide inter-individual and intra-individual variability, such as age, race, genotypic variation, liver dysfunction, the presence of food and drug-drug interactions with CYP450 inhibitors. These large variations in pharmacokinetics may be associated with decreased efficacy or increased toxicity. Therefore , monitoring of serum trough concentrations is recommended in the following infections: invasive aspergillosis treatment , endophthalmitis; meningitis or osteoarticular infections due to Exserohilum rostratum.