Skip to Content

Omnicef Omni-Pac

Generic Name: cefdinir (SEF dih neer)
Brand Name: Omnicef, Omnicef Omni-Pac

Medically reviewed by Drugs.com on Nov 20, 2018 – Written by Cerner Multum

What is Omnicef Omni-Pac?

Omnicef Omni-Pac is a cephalosporin (SEF a low spor in) antibiotic that is used to treat many different types of infections caused by bacteria.

Omnicef Omni-Pac may also be used for purposes not listed in this medication guide.

Important Information

Do not take Omnicef Omni-Pac if you are allergic to Omnicef Omni-Pac, or to similar antibiotics, such as Ceftin, Cefzil, Keflex, and others.

Before taking this medicine

You should not take this medicine if you are allergic to Omnicef Omni-Pac or to other cephalosporin antibiotics, such as:

Tell your doctor if you have ever had:

  • kidney disease (or if you are on dialysis);

  • intestinal problems, such as colitis; or

  • an allergy to any drugs (especially penicillins).

Omnicef Omni-Pac suspension (liquid) contains sucrose. Talk to your doctor before using this form of cefdinir if you have diabetes.

It is not known whether this medicine will harm an unborn baby. Tell your doctor if you are pregnant.

How should I take Omnicef Omni-Pac?

Follow all directions on your prescription label and read all medicine guides or instruction sheets. Use the medicine exactly as directed.

Shake the oral suspension (liquid) before you measure a dose. Use the dosing syringe provided, or use a medicine dose-measuring device (not a kitchen spoon).

You may take Omnicef Omni-Pac with or without food.

Use Omnicef Omni-Pac for the full prescribed length of time, even if your symptoms quickly improve. Skipping doses can increase your risk of infection that is resistant to medication. Omnicef Omni-Pac will not treat a viral infection such as the flu or a common cold.

Omnicef Omni-Pac can affect the results of certain medical tests. Tell any doctor who treats you that you are using this medicine.

Store at room temperature away from moisture and heat. Throw away any unused Omnicef Omni-Pac liquid that is older than 10 days.

What happens if I miss a dose?

Take the medicine as soon as you can, but skip the missed dose if it is almost time for your next dose. Do not take two doses at one time.

What happens if I overdose?

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

Overdose symptoms may include nausea, vomiting, stomach pain, diarrhea, or a seizure.

What should I avoid while taking Omnicef Omni-Pac?

Avoid using antacids or mineral supplements that contain aluminum, magnesium, or iron within 2 hours before or after taking Omnicef Omni-Pac. Antacids or iron can make it harder for your body to absorb this medicine. This does not include baby formula fortified with iron.

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 before using anti-diarrhea medicine.

Omnicef Omni-Pac side effects

Get emergency medical help if you have signs of an allergic reaction (hives, difficult breathing, swelling in your face or throat) or a severe skin reaction (fever, sore throat, burning eyes, skin pain, red or purple skin rash with blistering and peeling).

Call your doctor at once if you have:

  • fever, chills, body aches, flu symptoms;

  • pale skin, easy bruising, unusual bleeding;

  • seizure (convulsions);

  • fever, weakness, confusion;

  • dark colored urine, jaundice (yellowing of the skin or eyes); or

  • kidney problems--little or no urination, swelling in your feet or ankles, feeling tired or short of breath.

Common side effects may include:

  • nausea, vomiting, stomach pain, diarrhea;

  • vaginal itching or discharge;

  • headache; or

  • rash (including diaper rash in an infant taking liquid Omnicef Omni-Pac.

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

What other drugs will affect Omnicef Omni-Pac?

Tell your doctor about all your other medicines, especially:

  • probenecid; or

  • vitamin or mineral supplements that contain iron.

This list is not complete. Other drugs may affect Omnicef Omni-Pac, including prescription and over-the-counter medicines, vitamins, and herbal products. Not all possible drug interactions are listed here.

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.

Related questions

Hide