Do not use SALATAZ 4 g/0.5 g powder for solution for infusion: If allergic to piperacillin or tazobactam or any of the other ingredients of this medicine (listed in Description); If allergic to antibiotics known as penicillins, cephalosporins or other beta-lactamase inhibitors, as the patient may be allergic to SALATAZ 4 g/0.5 g powder for solution for infusion.