noun

• A synthetic compound which inhibits the multiplication of bacteria, used chiefly to treat urinary infections.

  A heterocyclic compound; chemical formula: C₁₂H₁₂N₂O₃

  ‘In India, almost 100% of the healthy population carry bacteria that are resistant to ampicillin, trimethoprim, nalidixic acid, and chloramphenicol.’

  More example sentences

  • ‘The original quinolone antibiotics included nalidixic acid, cinoxacin and oxolinic acid (no longer available in the United States).’
  • ‘There has also been a change in the antimicrobial susceptibility pattern; resistance to ampicillin and nalidixic acid has changed in recent times.’
  • ‘The organism isolated was resistant to ampicillin, cotrimoxazole, nalidixic acid and norfloxacin.’
  • ‘There was no association between nalidixic acid and chloramphenicol susceptibility.’