Chloramphenicol

  • Broad Spectrum

  • drug of choice for typhoid fever

  • risk of blood dyscrasias (e.g. aplastic anaemia)

  • bacteriostatic

  • reversibly binds 50S ribosome blocking elongation

resistance

  • plasmid-encoded chloramphenicol acetyltransferase

  • less commonly changes in pores make gram-negative bacteria less permeable