Cefdinir: Uses, Dosage, Side Effects, and Safety Information

Cefdinir is a third-generation cephalosporin antibiotic used to treat certain bacterial infections caused by susceptible bacteria, including some that are resistant to earlier cephalosporins. It’s used for bacterial infections such as certain respiratory tract infections, skin infections, and ear infections, and is active against a range of gram-negative and gram-positive bacteria. It is not appropriate for every respiratory, skin, or bacterial infection antibiotic choice depends on the suspected or confirmed cause and clinical assessment by a doctor. This guide covers cefdinir uses, dosage, side effects, precautions, drug interactions, use in pregnancy and breastfeeding, brand names and its approximate price in India.

At a Glance

Common Indications of Cefdinir

Cefdinir may be prescribed for certain susceptible bacterial infections, including:

• Community-acquired pneumonia
• Acute exacerbation of chronic bronchitis
• Acute maxillary sinusitis
• Pharyngitis/tonsillitis
• Uncomplicated skin and skin-structure infections
• Acute bacterial otitis media in appropriate pediatric patients

Not every respiratory, sinus, skin, or ear infection needs cefdinir specifically — antibiotic selection depends on the suspected or confirmed bacterial cause and your doctor’s clinical assessment.

Antibiotic Stewardship

Cefdinir treats bacterial infections — it does not work against viral infections such as the common cold or flu. It should only be used when prescribed by a healthcare professional. Take cefdinir exactly as prescribed and follow your healthcare professional’s instructions about the duration of treatment. Do not stop, extend, or restart treatment on your own. Unnecessary or inappropriate antibiotic use contributes to antimicrobial resistance, making infections harder to treat in the future.

Cefdinir Dosage and Administration

Cefdinir dosing depends on the infection being treated, its severity, the patient’s age, kidney function, the specific formulation, and the prescribing information for that product. There is no single universal cefdinir dose for every situation.

• Adults: As an indication-specific example from prescribing information, a commonly used regimen for certain infections is 300 mg taken orally, given once or twice daily depending on the specific infection and regimen, typically for 5–10 days. The exact dose, frequency, and duration should follow your doctor’s prescription for your specific infection.
• Children: Pediatric dosing is weight-based and indication-specific, and may be given once or twice daily depending on the regimen and infection, with a maximum daily dose per current prescribing information. As a general reference point, some indications use around 7 mg/kg per dose. This information is for general understanding only pediatric dosing should always be determined and given by a healthcare professional according to the exact product and instructions, not calculated or adjusted at home.

Cefdinir is available in oral capsules and suspension forms, and can generally be taken with or without food.

Important: Iron, Antacids, and Red Stools

Iron supplements: Iron supplements, including iron-containing multivitamins, can significantly reduce how much cefdinir your body absorbs. These should generally be separated from cefdinir by at least 2 hours.

Iron-fortified infant formula: This is different from iron supplements — iron-fortified infant formula does not have the same clinically significant interaction with cefdinir absorption and does not require the same routine 2-hour separation. Don’t feel you need to space out your baby’s regular formula feeds around cefdinir doses for this reason.

Antacids: Antacids containing aluminum or magnesium (such as Maalox or Mylanta) can reduce cefdinir absorption and should be separated from cefdinir by at least 2 hours. Calcium-only antacids (such as some formulations of Tums) are not known to cause the same significant interaction, though you should check the specific product with your pharmacist if you’re unsure, since not all calcium-containing products are formulated the same way.

Reddish or dark stools: Cefdinir can cause reddish or dark stools, particularly when taken with iron. This discoloration is usually caused by a cefdinir–iron complex forming in the gastrointestinal tract rather than by bleeding. However, this isn’t something to assume is always harmless without thought — black, tarry stools, visible blood, severe abdominal pain, or other concerning symptoms should be medically evaluated, and it’s reasonable to mention any stool color change to your doctor, especially in infants and young children, so it can be assessed in context rather than dismissed automatically.

Cefdinir Drug Interactions

• Iron supplements and iron-containing multivitamins: Can significantly reduce cefdinir absorption; separate by at least 2 hours (see above). This does not apply to iron-fortified infant formula in the same way.
• Antacids containing aluminum or magnesium: Can reduce cefdinir absorption; separate by at least 2 hours (see above).
• Probenecid: Can increase cefdinir exposure in the body by slowing how quickly the kidneys clear it. Your healthcare professional should know if you’re taking probenecid, as this may affect how cefdinir is prescribed or monitored.

Tell your doctor or pharmacist about all prescription medicines, over-the-counter medicines, vitamins, and supplements you’re taking — including iron and antacids, which are easy to overlook as “not medicines.”

Adverse Effects of Cefdinir

• Diarrhea
• Nausea and vomiting
• Skin rash
• Vaginal yeast infections
• Reddish or dark stools, particularly when combined with iron (see above for context)
• Clostridium difficile-associated diarrhea
• Serious allergic reactions, including swelling of the face or throat or difficulty breathing — seek urgent medical attention if these occur

Severe or persistent diarrhea, especially if watery or bloody, needs medical evaluation during or after treatment. Not every episode of diarrhea during antibiotic treatment means a C. difficile infection, but severe, persistent, or bloody diarrhea should be checked by a doctor.

Contraindications of Cefdinir

• Known hypersensitivity to cefdinir or cephalosporin antibiotics, according to the relevant product labeling.

Cefdinir Precautions

• Penicillin allergy history: If you’ve had a reaction to penicillin in the past, tell your doctor which medicine caused it, what the reaction was, how severe it was, and when it happened. Not every past penicillin allergy carries the same cross-reactivity risk with cefdinir, and your doctor can help assess this rather than automatically ruling out cefdinir for everyone with any penicillin allergy history.
• Kidney impairment: See Kidney Considerations below.
• History of colitis or GI conditions: Tell your doctor, since antibiotic-associated diarrhea risk may need extra consideration.

Pregnancy, Breastfeeding, Liver, and Kidney Considerations for Cefdinir

• Pregnancy: Available human data have not established a clear association with major birth defects, but cefdinir should be used during pregnancy only when a healthcare professional determines that treatment is appropriate for the specific situation.
• Breastfeeding: People who are breastfeeding should discuss cefdinir treatment with their healthcare professional, particularly when treating a newborn or premature infant, if relevant to their situation.
• Liver: Liver-related laboratory abnormalities or adverse effects can occur and should be monitored by your care team, though kidney function is the more important consideration for cefdinir clearance and dosing, since the drug is cleared mainly through the kidneys.
• Kidneys: Cefdinir is cleared mainly through the kidneys. People with significant renal impairment may need a lower dose or less frequent dosing, based on renal-function-based adjustment in current prescribing information. This dose adjustment should be determined by your doctor, not calculated at home.

Popular Brands of Cefdinir

• India: Cednir
• US: Omnicef

Brand names, strengths, formulations, and availability vary by country and manufacturer, and other cefdinir brands may also be available.

Cefdinir Price in India

Cefdinir 300 mg capsules (various brands, strip of 10) typically cost approximately ₹200–₹550, depending on the specific brand and pharmacy.

Prices vary by brand, strength, pack size, pharmacy, location, and discounts, so check the current price for your specific prescribed brand with a licensed pharmacy.

How HealthPil Can Help

If you have symptoms of a bacterial infection or questions about cefdinir, consult a qualified doctor. A doctor can review your symptoms, medical history, current medicines, and test results to determine whether cefdinir is appropriate. Book a consultation.