Cephalosporin antibiotic / beta-lactamase inhibitor combinations are used to treat complicated urinary tract infections, stomach infections, and pneumonia. These combinations work by using a cephalosporin antibiotic to kill bacteria and a beta-lactamase inhibitor to prevent bacteria from breaking down the antibiotic, making the treatment more effective. These medications are typically available in injectable forms. Examples include ceftazidime / avibactam (Avycaz) and ceftolozane / tazobactam (Zerbaxa). You will typically receive these treatments in a healthcare setting.