Only these drugs are antipseudomonal: Pip/Tazo, Ticarcillin/Clavulinic Acid, Ceftazidime, Cefepime, Meropenem, Imipenem, Aztreonam, Ciprofloxacin, Aminoglycosides, Colistin

Variable resistance patterns with mechanisms to be resistant to all of these drugs, which is why double coverage is often used prior to susceptibility results