Zosyn is an injectable antibacterial combination containing piperacillin sodium and tazobactam sodium, intended for intravenous administration. It is formulated as a sterile powder in glass vials. Piperacillin is a semisynthetic antibacterial, and tazobactam acts as a beta-lactamase inhibitor. Key inactive components include 2.84 mEq of sodium per gram of piperacillin in the combination.

How should I use this medication?

This medication is injected into a vein. It is usually given by a care team in a hospital or clinic setting. It may also be given at home. If you get this medication at home, you will be taught how to prepare and give it. Use exactly as directed. Take it as directed on the prescription label at the same time every day. Take all of this medication unless your care team tells you to stop it early. Keep taking it even if you think you are better. It is important that you put your used needles and syringes in a special sharps container. Do not put them in a trash can. If you do not have a sharps container, call your pharmacist or care team to get one. Talk to your care team about the use of this medication in children. While it may be prescribed for children as young as 2 months for selected conditions, precautions do apply.

Overdosage: If you think you have taken too much of this medicine contact a poison control center or emergency room at once. NOTE: This medicine is only for you. Do not share this medicine with others.

What if I miss a dose?

If you get this medication in the hospital or clinic: It is important not to miss your dose. Call your care team if you are unable to keep an appointment. If you give yourself this medication at home: If you miss a dose, take it as soon as you can. If it is almost time for your next dose, take only that dose. Do not take double or extra doses.

Where should I keep my medication?

Keep out of the reach of children and pets. You will be instructed on how to store this medication. Get rid of any unused medication after the expiration date. To get rid of medications that are no longer needed or have expired: -Take the medication to a medication take-back program. Check with your pharmacy or law enforcement to find a location. -If you cannot return the medication, ask your pharmacist or care team how to get rid of this medication safely.

NOTE: This sheet is a summary. It may not cover all possible information. If you have questions about this medicine, talk to your doctor, pharmacist, or health care provider.

What side effects may I notice from receiving this medication?

Side effects that you should report to your care team as soon as possible: -Allergic reactions—skin rash, itching, hives, swelling of the face, lips, tongue, or throat -Kidney injury—decrease in the amount of urine, swelling of the ankles, hands, or feet -Redness, blistering, peeling, or loosening of the skin, including inside the mouth -Seizures -Severe diarrhea, fever -Unusual vaginal discharge, itching, or odor Side effects that usually do not require medical attention (report to your care team if they continue or are bothersome): -Constipation -Diarrhea -Headache -Nausea -Pain, redness, or irritation at injection site -Trouble sleeping

This list may not describe all possible side effects. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.

What should I tell my care team before I take this medication?

They need to know if you have any of these conditions: -Bleeding disorder -Diet low in salt -Kidney disease -Low levels of potassium in the blood -Seizures -Stomach or intestine problems, such as colitis -An unusual or allergic reaction to piperacillin, tazobactam, other penicillin or cephalosporin antibiotics, other medications, foods, dyes, or preservatives -Pregnant or trying to get pregnant -Breast-feeding

What may interact with this medication?

-Aspirin and aspirin-like medications -Certain medications that prevent or treat blood clots, such as warfarin, heparin, enoxaparin, and dalteparin -Estrogen or progestin hormones -Methotrexate -Probenecid -Vancomycin -Vecuronium used for sleep during surgery

This list may not describe all possible interactions. Give your health care provider a list of all the medicines, herbs, non-prescription drugs, or dietary supplements you use. Also tell them if you smoke, drink alcohol, or use illegal drugs. Some items may interact with your medicine.

What should I watch for while using this medication?

Your condition will be monitored carefully while you are receiving this medication. Tell your care team if your symptoms do not start to get better or if they get worse. This medication may cause serious skin reactions. They can happen weeks to months after starting the medication. Contact your care team right away if you notice fevers or flu-like symptoms with a rash. The rash may be red or purple and then turn into blisters or peeling of the skin. You may also notice a red rash with swelling of the face, lips, or lymph nodes in your neck or under your arms. Do not treat diarrhea with over the counter products. Contact your care team if you have diarrhea that lasts more than 2 days or if it is severe and watery. If you have diabetes, you may get a false-positive result for sugar in your urine. Check with your care team.