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Baci-IM (injection)

Generic name: bacitracin (injection) [ BAS-i-TRAY-sin ]
Drug class: Miscellaneous antibiotics

Medically reviewed by on Sep 26, 2022. Written by Cerner Multum.

What is Baci-IM?

Baci-IM is an antibiotic that treats staph infection caused by a bacteria called staphylococcus (STAF-il-oh-KOK-us).

Baci-IM is used in infants to treat pneumonia. It is also used to treat an infection that causes pus to build up between the lungs and the membrane that covers them.

Baci-IM may also be used for purposes not listed in this medication guide.


Baci-IM can harm your baby's kidneys. This effect is increased when the baby also uses certain other medicines, especially injected antibiotics. Your baby's kidney function will need to be tested before and during treatment with this medicine.

Before taking this medicine

Your baby should not receive Baci-IM if he or she is allergic to Baci-IM.

To make sure Baci-IM is safe for your baby, tell the doctor if your baby has:

How is Baci-IM given?

Baci-IM is injected into a muscle. A healthcare provider will give your baby this injection.

Lung infections in infants are serious conditions, and your baby will most likely be kept in the hospital while being treated with Baci-IM.

While receiving Baci-IM, your baby's kidney function will need to be tested daily.

Make sure your baby receives this medicine for the full prescribed length of time. Symptoms may improve before the infection is completely cleared. Skipping doses may also increase the risk of further infection that is resistant to antibiotics. Baci-IM will not treat a viral infection such as the flu or a common cold.

What happens if I miss a dose?

Because your child will receive Baci-IM in a clinical setting, he or she is not likely to miss a dose.

What happens if I overdose?

Since Baci-IM is given by a healthcare professional in a medical setting, an overdose is unlikely to occur.

What should I avoid while receiving Baci-IM?

Antibiotic medicines can cause diarrhea, which may be a sign of a new infection. If your baby has diarrhea that is watery or bloody, call your doctor. Do not give your baby anti-diarrhea medicine unless your doctor tells you to.

Baci-IM side effects

Get emergency medical help if your baby has any of these signs of an allergic reaction: hives; difficult breathing; swelling of the face, lips, tongue, or throat.

While receiving Baci-IM, your baby will be watched for the following side effects:

  • diarrhea that is watery or bloody;

  • urinating more than usual or more often;

  • little or no urinating (fewer wet diapers);

  • blood in the urine;

  • lower back pain; or

  • painful urination.

Common side effects include:

This is not a complete list of side effects and others may occur. Tell your doctor about any unusual or bothersome side effect. You may report side effects to FDA at 1-800-FDA-1088.

What other drugs will affect Baci-IM?

Baci-IM can harm your baby's kidneys. This effect is increased when the baby also receives certain other medicines. Tell your doctor about all medicines your baby uses, especially:

This list is not complete. Other drugs may interact with bacitracin, including prescription and over-the-counter medicines, vitamins, and herbal products. Not all possible interactions are listed in this medication guide.

Further information

Remember, keep this and all other medicines out of the reach of children, never share your medicines with others, and use this medication only for the indication prescribed.

Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.