Fosfomycin 3gm Sachet is a broad-spectrum antibiotic classified as a phosphonic acid derivative. It is primarily used to treat urinary tract infections (UTIs) caused by a range of Gram-positive and Gram-negative bacteria. Fosfomycin works by inhibiting bacterial cell wall synthesis, specifically targeting the enzyme UDP-N-acetylmuramic acid (MurA), which is crucial for the formation of peptidoglycan, an essential component of bacterial cell walls. Due to its unique mechanism of action, fosfomycin is effective against a variety of resistant bacterial strains, including some that are resistant to other antibiotics. It is often prescribed as a single-dose treatment for uncomplicated UTIs, making it convenient and effective for patients. Fosfomycin is usually administered orally in the form of a powder that is dissolved in water before ingestion. While it is generally well-tolerated, potential side effects include gastrointestinal discomfort and, rarely, allergic reactions. Always use fosfomycin as directed by a healthcare provider to ensure efficacy and minimize risks.