Acute Bacterial Sinusitis (ABS) , Acute Exacerbations of Chronic Bronchitis (AECB), Community-Acquired Pneumonia (CAP), ENT Infections.Meropenem, imipenem, ertapenem, and faropenem are atypical β-lactam antibiotics having the broadest antibacterial spectrum together with strong antibacterial activity. They are important antibacterial drugs available to treat severe bacterial infections.