Cefalexin is an antibiotic that belongs to the class of medications known as cephalosporins. It is commonly used to treat various bacterial infections, including those affecting the skin, respiratory tract, and urinary system. Cefalexin works by inhibiting the growth of bacteria, helping the body to fight off infections. This medication is typically taken orally in the form of capsules or liquid. It is important to complete the full course of treatment as prescribed by a healthcare provider, even if symptoms improve, to ensure that the infection is fully eradicated and to prevent antibiotic resistance.