Rifkind D, Crowder E D, Hyland R N
Antimicrob Agents Chemother. 1974 Dec;6(6):783-4. doi: 10.1128/AAC.6.6.783.
Rifampin was shown in vitro to decrease the amphotericin B minimal inhibitory concentrations of all of 10 strains of Coccidioides immitis tested. These decreases ranged from two- to fourfold and occurred with rifampin concentrations of 10 to 40 mug/ml. Rifampin alone was without effect.