Cefoselis hydrochloride is primarily used as a broad-spectrum antibiotic in the treatment of various bacterial infections. It is effective against both Gram-positive and Gram-negative bacteria, making it suitable for treating respiratory tract infections, urinary tract infections, and skin infections. It is often administered intravenously in hospital settings for severe infections, particularly when other antibiotics are ineffective. Its mechanism of action involves inhibiting bacterial cell wall synthesis, leading to bacterial cell death. It is also used in postoperative infections and septicemia, providing a critical option in managing complex bacterial infections.