Nitrofurantoin, 5g, is a laboratory-grade antibiotic used to study bacterial resistance, particularly in the context of urinary tract infections (UTIs). It is effective against a broad spectrum of Gram-positive and Gram-negative bacteria by disrupting their protein synthesis, DNA replication, and overall metabolism. The 5g quantity is ideal for use in antimicrobial susceptibility testing, such as Minimum Inhibitory Concentration (MIC) assays, disk diffusion, and other microbiological tests. Nitrofurantoin is also used in research settings to better understand antimicrobial resistance mechanisms, including the development of resistance in UTI pathogens.