Cephalexin monohydrate is widely used as an antibiotic to treat bacterial infections. It is effective against a range of infections, including respiratory tract infections, skin and soft tissue infections, urinary tract infections, and bone infections. It works by inhibiting the growth of bacteria, making it a common choice for treating conditions like pneumonia, cellulitis, and strep throat. It is often prescribed for both adults and children due to its safety profile and effectiveness. Additionally, it is used in veterinary medicine to treat infections in animals. The medication is typically administered orally, making it convenient for outpatient treatment.