Furagin, also known as nitrofurantoin, is a synthetic nitrofuran derivative with the molecular formula C₈H₆N₄O₅ and CAS number 67-20-9. It is a specialty chemical used as an antimicrobial agent, appearing as yellow crystals or powder with solubility in water and a purity of 99%. It is particularly effective against a variety of bacterial infections, especially Gram-negative and some Gram-positive bacteria.

Furagin is commonly prescribed for treating urinary tract infections (UTIs), such as cystitis, urethritis, and pyelonephritis, due to its ability to concentrate in the urinary system and inhibit bacterial growth by damaging bacterial DNA and interfering with enzymes. This targeted action minimizes systemic impact. It is typically administered in tablet form and is also used in veterinary medicine for similar infections in animals.

Patients are advised to maintain hydration to enhance efficacy and reduce side effects like nausea or gastrointestinal upset. It should be used under medical supervision, particularly in cases of mild infections or when other antibiotics are unsuitable.