Cephalexin is a first-generation cephalosporin antibiotic widely used to treat bacterial infections. Cephalexin targets gram-positive bacteria, such as Streptococcus and Staphylococcus, and some gram-negative strains. It’s effective for skin infections, urinary tract infections, respiratory infections, and bone infections caused by susceptible bacteria. Cephalexin works by disrupting bacterial cell wall synthesis, leading to cell death. Typically prescribed in oral capsule or liquid form, cephalexin capsule is taken multiple times daily, depending on the infection’s severity. While generally well-tolerated, cephalexin may cause side effects like nausea or diarrhea. Cephalexin resistance is a concern, requiring careful use to maintain its efficacy.