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Amphotericin B is a first-line agent for the treatment of invasive aspergillosis. However, relatively little is known about the pharmacodynamics of amphotericin B for invasive pulmonary aspergillosis. We studied the pharmacokinetics (PK) and pharmacodynamics (PD) of amphotericin B deoxycholate (DAMB), amphotericin B lipid complex (ABLC), and liposomal amphotericin B (LAMB) by using a neutropenic-rabbit model of invasive pulmonary aspergillosis. The study endpoints were lung weight, infarct score, and levels of circulating galactomannan and (1→3)-β-d -glucan. Mathematical models were used to describe PK-PD relationships. The experimental findings were bridged to humans by Monte Carlo simulation. Each amphotericin B formulation induced a dose-dependent decline in study endpoints. Near-maximal antifungal activity was evident with DAMB at 1 mg/kg/day and ABLC and LAMB at 5 mg/kg/day. The bridging study suggested that the “average” patient receiving LAMB at 3 mg/kg/day was predicted to have complete suppression of galactomannan and (1→3)-β-d -glucan levels, but 20 to 30% of the patients still had a galactomannan index of &gt;1 and (1→3)-β-d -glucan levels of &gt;60 pg/ml. All formulations of amphotericin B induce a dose-dependent reduction in markers of lung injury and circulating fungus-related biomarkers. A clinical dosage of liposomal amphotericin B of 3 mg/kg/day is predicted to cause complete suppression of galactomannan and (1→3)-β-d -glucan levels in the majority of patients.

Pharmacodynamics of Amphotericin B Deoxycholate, Amphotericin B Lipid Complex, and Liposomal Amphotericin B against Aspergillus fumigatus