Quinolones

Synthetic antibacterials deployed against a wide span of animal and farmed-fish diseases. First-generation members such as oxolinic acid and nalidixic acid strike mainly Gram-negative pathogens, while later generations carrying fluorine or piperazine rings broaden the spectrum considerably. Their veterinary importance makes residue monitoring in meat, milk, and aquaculture products mandatory, with maximum limits and withdrawal times enforced. Prudent-use guidelines aim to slow the resistance that overuse encourages, preserving these drugs for cases where they are truly needed. Aquaculture veterinarians prescribe them under professional supervision with withdrawal times.