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Totacillin-N (injection)

Generic name: ampicillin (injection)

Brand names: Omnipen-N injection, Totacillin-N injection

Last updated November 3, 2026 0 views
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What is Totacillin-N?

Totacillin-N is a type of penicillin antibiotic that helps fight bacteria.

Totacillin-N is used to treat or prevent many kinds of infections, including bladder infections, pneumonia, meningitis, gonorrhea, and infections of the stomach, intestines, heart, or blood.

Totacillin-N may also be used for reasons not mentioned in this medication guide.

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Warnings

You should not use Totacillin-N if you are allergic to any penicillin antibiotic.

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Before taking this medicine

You should not use this medicine if you are allergic to Totacillin-N or any other penicillin antibiotic, like amoxicillin (Amoxil, Augmentin, Moxatag, and others), carbenicillin, dicloxacillin, or penicillin.

To make sure Totacillin-N is safe for you, tell your doctor if you have:

  • allergies to any foods or drugs;
  • an allergy to a cephalosporin antibiotic, like cefdinir (Omnicef), cefprozil (Cefzil), cefuroxime (Ceftin), cephalexin (Keflex), and others; or
  • if you also take a medicine called allopurinol.

This medicine is not expected to harm an unborn baby. Tell your doctor if you are pregnant or plan to become pregnant.

Totacillin-N can make birth control pills less effective. Ask your doctor about using non-hormonal birth control (condom, diaphragm with spermicide) to prevent pregnancy.

Ampicillin can pass into breast milk and may harm a nursing baby. Tell your doctor if you are breastfeeding a baby.

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Totacillin-N side effects

Get emergency medical help if you have any of these signs of an allergic reaction: hives; difficulty breathing; swelling of your face, lips, tongue, or throat.

Totacillin-N may cause serious side effects. Call your doctor right away if you have:

  • severe stomach pain, diarrhea that is watery or bloody;
  • fever, swollen glands, skin rash, joint pain, general ill feeling; or
  • pale skin, easy bruising or bleeding, unusual weakness.

Common side effects of Totacillin-N may include:

  • nausea, vomiting, stomach pain;
  • itching or rash;
  • swollen, black, or "hairy" tongue; or
  • vaginal itching or discharge.

This is not a complete list of side effects and others may happen. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.

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How is Totacillin-N given?

Totacillin-N is injected into a muscle, or into a vein through an IV. You may be shown how to use an IV at home. Do not self-inject Totacillin-N if you do not understand how to give the injection and properly dispose of used needles, IV tubing, and other items used to inject the medicine.

You may need to mix Totacillin-N with a liquid (diluent) before using it. If you are using the injections at home, be sure you understand how to properly mix and store the medicine. You should use the injection as soon as possible after mixing it.

Use a disposable needle and syringe only once. Follow any state or local laws about throwing away used needles and syringes. Use a puncture-proof "sharps" disposal container (ask your pharmacist where to get one and how to throw it away). Keep this container out of the reach of children and pets.

If you are being treated for gonorrhea, your doctor may also have you tested for syphilis, another sexually transmitted disease.

Your doctor may switch you from Totacillin-N to an oral form of this medicine. Use this medicine for the full prescribed length of time. Your symptoms may improve before the infection is completely cleared. Skipping doses may also increase your risk of further infection that is resistant to antibiotics. This medicine will not treat a viral infection such as the flu or a common cold.

If you use this medicine long-term, you may need frequent medical tests.

Totacillin-N can cause unusual results with certain lab tests for glucose (sugar) in the urine. Tell any doctor who treats you that you are using this medicine.

Store unmixed Totacillin-N at room temperature away from moisture and heat.

After mixing your medicine, you will need to use it within a certain number of hours. This will depend on the diluent used, and whether the mixture is stored at room temperature or in a refrigerator. Carefully follow the mixing and storage instructions provided with your medicine. Ask your pharmacist if you have questions.

What happens if I miss a dose?

Use the missed dose as soon as you remember. Skip the missed dose if it is nearly time for your next scheduled dose. Do not use extra medicine to compensate for the missed dose.

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What happens if I overdose?

Seek emergency medical attention or call the Poison Help line at 1-800-222-1222.

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

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What other drugs will affect Totacillin-N?

Other drugs may interact with ampicillin, including prescription and over-the-counter medicines, vitamins, and herbal products. Inform each of your health care providers about all medicines you are currently taking and any medicines you begin or stop using.

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Common questions about Totacillin-N

What happens if antibiotics don’t work for UTI?
If an antibiotic does not fully treat your UTI, the bacteria may be resistant and the infection can get worse. You may need more testing or a different antibiotic. A bladder infection can spread to the kidneys or bloodstream, causing a serious medical emergency. Contact your healthcare provider if your symptoms do not improve. Continue reading
Who discovered Penicillin and why does it still matter today?
Penicillin, the world’s first true antibiotic, was discovered in 1928 by Scottish bacteriologist Alexander Fleming at St. Mary’s Hospital in London. The initial discovery happened after he noticed that a mold called Penicillium notatum prevented the bacteria around it from growing on a culture plate. Continue reading

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Before you take this medicine: the information on this page is general and may not cover your personal circumstances. Read the label supplied with your medicine and ask a pharmacist or doctor if you are unsure, especially if you are pregnant, breastfeeding, taking other medicines or managing a long-term condition.
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Content is provided for education and is not medical advice. See our medical disclaimer.