Cefdinir – How to use | Dosage | Side effects

Cefdinir is a drug from the group of cephalosporin antibiotics. Cefdinir works by killing bacteria, and therefore is used to treat infections.

It is used to treat the following conditions:

  • Middle ear inflammation (otitis media)
  • Respiratory tract infections (tonsillitis, sinusitis, pneumonia, sore throat)
  • Skin and soft tissue infections


It should be avoided in the following conditions:

  • If you are allergic to cefdinir or other similar medications such as:
    • ceftriaxone,
    • cephalexin,
    • cefaclor,
    • cefadroxil,
    • cefazolin,
    • cefepime,
    • ampicillin,
    • amoxicillin,
    • co-amoxiclav and others. Symptoms of an allergy include:
      • skin rash,
      • itching,
      • redness of the skin,
      • swelling of the face,
      • the swelling of the tongue,
      • difficulty breathing. Allergy can lead to anaphylactic shock, that can be fatal.
  • If you have renal impairment.
  • If you are pregnant or breastfeeding.
  • If you have bowel disorder called colitis

It is very important to take this medicine as long as your doctor recommended, otherwise, Cefdinir will not eliminate all bacteria. Those bacteria that survive will develop a mechanism to fight against Cefdinir. So, the next time you get a similar infection, this drug will not help you. Therefore, it is very important to use this medicine exactly as your doctor tells you to.

If you notice diarrhea, especially if if you have blood in the stool, contact your doctor immediately, because that is a sign that bowel infection has occurred.

Use of Cefdinir during pregnancy and breastfeeding

According to FDA, Cefdinir belongs to group B (FDA: Group B). This means that animal studies have shown that it is not harmful to the fetus, but there are no studies on humans. Consult your doctor about the benefits and risks of using during pregnancy.

Cefdinir passes into breast milk. Avoid breastfeeding while using this medicine.

How to use

Usual dose is 300 mg every 12 hours (twice a day). For severe infections the dose can be increased. This medicine should be used for 10-14 days.

In children, the dose should be calculated according to the child's body weight.

Cefdinir can be taken regardless of food, with a 8 fl. oz. of water.

Use with other medicines (Interactions)

It should be avoided in combination with the following medicines:

  • Medicines used to treat gout such as:
    • allopurinol,
    • probenecid.
  • Birth control pills (oral contraceptives)

Side effects

It may cause the following side effects:

  1. flu-like symptoms (fever, sore throat),
  2. headache,
  3. dizziness,
  4. nausea,
  5. diarrhea (blood in stool may occur),
  6. loss of appetite,
  7. jaundice (yellowing of the skin and eyes),
  8. dry mouth,
  9. constipation,
  10. insomnia,
  11. panic disorder,
  12. menstrual disorder,
  13. allergy.

If you are experiencing any side effects, you should contact your doctor.

Information on this website are provided for educational purposes only and are not intended for medical advice, diagnosis or treatment.

If you have any concerns or questions about your health, you should always consult with a physician or other health-care professional.