The recent shortage of the brand name drug Fungizone has necessitated a change to generic formulations of amphotericin B deoxycholate. Clinical trials cannot be conducted in a timely manner to provide data on the safety and efficacy of these formulations. We therefore compared generic amphotericin B and Fungizone for activity and safety in the treatment of experimental invasive pulmonary aspergillosis (IPA) in persistently neutropenic rabbits. Fungizone and generic amphotericin B are similar in efficacy, pharmacokinetics, and safety in the treatment of experimental IPA.