Nalidixic acid is an antibacterial agent used to treat infections caused by bacteria. While there are no direct synonyms for this drug, it is sometimes classified as a quinolone antibiotic. Other similar antibiotics may include ciprofloxacin, levofloxacin, and moxifloxacin. These drugs work by preventing the bacteria from replicating, thereby stopping the infection from spreading. Nalidixic acid is used to treat infections in the urinary tract, but it is important to note that some types of bacteria have become resistant to this drug. As with any medication, it is important to consult with a healthcare provider before taking nalidixic acid or any other antibiotics.