Cefdinir (Omnicef) is a cephalosporin antibiotic.

Ask your doctor or pharmacist to explain any part you do not understand.

Take Cefdinir (Omnicef) exactly as directed.

Check with your doctor if any of these most COMMON side effects persist or become bothersome:

Diarrhea; headache; nausea.

Seek medical attention right away if any of these SEVERE side effects occur:
Severe allergic reactions (rash; hives; itching; difficulty breathing; tightness in the chest; swelling of the mouth, face, lips, or tongue); bloody stools; change in the amount of urine produced; dark urine; fever, chills, or sore throat; red, swollen, blistered, or peeling skin; seizures; severe diarrhea or vomiting; severe stomach pain or cramps; unusual bleeding or bruising; vaginal irritation or discharge; yellowing of the skin or eyes.

This is not a complete list of all side effects that may occur. If you have questions or need medical advice about side effects, contact your doctor or health care provider.

Tell your health care provider if you are taking any other medicines, especially any of the following:

Probenecid because it may increase the risk of Cefdinir (Omnicef)'s side effects
Live typhoid vaccine because its effectiveness may be decreased by Cefdinir (Omnicef)

This may not be a complete list of all interactions that may occur. Ask your health care provider if Cefdinir (Omnicef) may interact with other medicines that you take.

In case of overdose, call your local poison control center at 1-800-222-1222. If the victim has collapsed or is not breathing, call local emergency services at 911

Tell your doctor or pharmacist if you have any medical conditions, especially if any of the following apply to you:

if you are pregnant, planning to become pregnant, or are breast-feeding

if you are taking any prescription or nonprescription medicine, herbal preparation, or dietary supplement

if you have allergies to medicines, foods, or other substances

if you have had a severe allergic reaction (eg, severe rash, hives, difficulty breathing, dizziness) to a penicillin (eg, amoxicillin) or other beta-lactam antibiotic (eg, imipenem)

if you have a blood clotting disorder, kidney problems, seizures, diabetes, or stomach or bowel problems (eg, inflammation)

Do not take a double dose to make up for a missed one.

Cefdinir (Omnicef) is used to treat mild to moderate infections caused by certain bacteria.

Ask your doctor or pharmacist for more information.

Store it at room temperature and away from excess heat and moisture.

Contact your doctor right away if stomach pain or cramps, severe diarrhea, or bloody stools occur. Do not treat diarrhea without first checking with your doctor.

If you are taking Cefdinir (Omnicef) and a product that contains iron, your stools may turn a reddish color. This is normal and not a cause for concern.

Diabetes patients - Cefdinir (Omnicef) may cause the results of some tests for urine ketones or glucose to be wrong. Ask your doctor before you change your diet or the dose of your diabetes medicine.

Cefdinir (Omnicef) may interfere with certain lab tests. Be sure your doctor and lab personnel know you are using Cefdinir (Omnicef).