Amphotericin B as a lipid complex and as a deoxycholate suspension (Fungizone) was tested against murine blastomycosis. All doses of each form prolonged survival (P < 0.05 to 0.001). Fungizone was more effective than lipid complex at doses of 0.8 mg/kg of body weight. However, lipid complex at 12.8 mg/kg was not toxic and superior in efficacy (P < 0.001) to 2.0 mg of Fungizone per kg (a toxic dose), and it cleared all animals of infection. Lipid complex is an effective therapy for murine blastomycosis.