Description: The Piperacillin and tazobactam combination injection is used to treat bacterial infections in many different parts of the body (e.g., stomach or bowel, lungs, skin, female reproductive organs, bladder). This medication can only be given by a physician who is experienced with its use. Do not give this medicine without your doctor's approval. It is important to follow your doctor's instructions when giving this drug. Ask your doctor or pharmacist if you have any questions regarding the proper administration of this medication. Consult your doctor before giving this drug to a child, woman, or elderly person.