Empiric therapy for hospital-acquired pneumonia without increased risk for antibiotic-resistant bacteria due to prior IV antibiotic use within 90 days in an institution where MRSA incidence is < 20% (of S aureus isolates) and P aeruginosa resistance is < 10% for commonly used empiric antipseudomonal antibiotics, could include any one of the following: Piperacillin / tazobactam Cefepime Levoﬂoxacin Imipenem Meropenem Doses depend on renal function (see table Usual Doses of Commonly Prescribed Antibiotics).