Only these drugs are antipseudomonal: Pip/Tazo, Ticar/Clav, 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