<prompt>  Imipenem, a newer antibiotic with a broad antibacterial spectrum is coadministered with cilastin because -The combination of these antibiotics is Synergistic against Pseudomonas speciesCilastin aids the gastrointestinal absorption of the active moiety, imipenemCilastin inhibits a Beta-lactamase that destroys imipenemCilastin inhibits an enzyme in the kidney that destroys imipenem 