Atezolizumab + Piperacillin-tazobactam

MediHelp rates the interaction as minor. Atezolizumab and Piperacillin-tazobactam have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised. Observational data link antibiotic exposure around the start of immune checkpoint inhibitor therapy with poorer outcomes, possibly through gut microbiome disruption. The evidence is associative and confounded by patient illness severity. The effect on any individual patient is uncertain.

MediHelp rates it minor, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Use the antibiotic only for a clear indication and de-escalate or stop as soon as culture results and clinical status allow. Do not withhold needed antibiotics.

MediHelp also lists interactions of Piperacillin-tazobactam with, for example, Vancomycin, Amikacin, Antithrombin alfa. The full list is on the Piperacillin-tazobactam page.