Combined activity of amphotericin B and 5-fluorocytosine against Cryptococcus neoformans in vitro and in vivo in mice.

Journal Article (Journal Article)

The in vitro and in vivo activities of amphotericin B and 5-fluorocytosine (5-FC) alone and in combination were studied to determine possible drug interactions against two strains of Cryptococcus neoformans, one sensitive to 5-FC and one resistant to 5-FC. In vitro tube dilution studies demonstrated only additive effects with the 5-FC-sensitive organism but antagonism with eth 5-FC-resistant organism. A mouse model of cryptococcal meningitis allowed comparative drug trails in a new model for the detection of drug interactions. Drug combinations were no more effective against meningitis caused by the 5-FC-sensitive organism than the additive effects of the individual drugs. However, meningitis caused by the 5-FC-resistant Cryptococcus responded less to drug combinations than to either drug alone. Serum levels of amphotericin B and 5-FC were comparable in all groups. No evidence of toxicity from the drug combinations was found. No inhibition of development of resistance to 5-FC by the combination with amphotericin B was detected.

Full Text

Duke Authors

Cited Authors

  • Hamilton, JD; Elliott, DM

Published Date

  • February 1, 1975

Published In

Volume / Issue

  • 131 / 2

Start / End Page

  • 129 - 137

PubMed ID

  • 1090685

International Standard Serial Number (ISSN)

  • 0022-1899

Digital Object Identifier (DOI)

  • 10.1093/infdis/131.2.129


  • eng

Conference Location

  • United States