Omnicef vs. Keflex

Are Omnicef and Keflex the Same Thing?

Omnicef (cefdinir) and Keflex (cephalexin) are cephalosporin antibiotics used to treat many different types of infections caused by bacteria.

Keflex is also used before dental procedures in patients identified with certain heart-related conditions to prevent bacterial infections of the heart known as endocarditis.

The brand name Omnicef is discontinued in the U.S. Generic versions of cefdinir are available.

What Are Possible Side Effects of Omnicef?

Common side effects of Omnicef include:

Tell your doctor if you experience serious side effects of Omnicef including watery or bloody diarrhea, chest pain, fever, chills, body aches, flu symptoms, unusual bleeding, seizures (convulsions), pale or yellowed skin, dark colored urine, fever, confusion or weakness, jaundice (yellowing of the skin or eyes); fever, sore throat, and headache with a severe blistering, peeling, and red skin rash; increased thirst, loss of appetite, swelling, weight gain, feeling short of breath, or urinating less than usual or not at all.

What Are Possible Side Effects of Keflex?

Common side effects of Keflex include:

  • diarrhea,
  • dizziness,
  • tiredness,
  • headache,
  • stomach upset,
  • abdominal pain,
  • joint pain,
  • vaginal itching or discharge,
  • nausea,
  • vomiting,
  • itching,
  • swelling, and
  • rash.

What Is Omnicef?

Omnicef (cefdinir) is a cephalosporin antibiotic used to treat many different types of infections caused by bacteria. The brand name Omnicef is discontinued in the U.S. Omnicef is available in generic form.

What Is Keflex?

Keflex (cephalexin) is a cephalosporin antibiotic prescribed to treat bacterial infections. Keflex is also used before dental procedures in patients identified with certain heart-related conditions to prevent bacterial infections of the heart known as endocarditis. Keflex is available as a generic drug.

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What Drugs Interact With Omnicef?

Omnicef may interact with blood thinners, antibiotics, antidepressants, anti-malaria medications, medicine to prevent or treat nausea and vomiting, medicines to treat psychiatric disorders, migraine headache medicines, nonsteroidal anti-inflammatory drugs (NSAIDs), steroids, or narcotics.

What Drugs Interact With Keflex?

Keflex and amoxicillin may interact with probenecid and blood thinners.

Keflex may also interact with metformin.

How Should Omnicef Be Taken?

The recommended dose of Omnicef is 150 mg every 13 weeks administered by deep intramuscular (IM) injection in the gluteal or deltoid muscle. Omnicef should not be used as a long-term birth control method (longer than 2 years).

How Should Keflex Be Taken?

Keflex dosage depends on the condition being treated. Keflex should be used with caution in patients who have kidney disease and those who report a history of penicillin allergy.

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References


DailyMed. Ceftin (Omnicef) Product Information.

https://dailymed.nlm.nih.gov/dailymed/drugInfo.cfm?setid=2f439b86-59d6-4350-aeb4-c904b3781db4

DailyMed. Keflex Prescribing Information.

https://dailymed.nlm.nih.gov/dailymed/drugInfo.cfm?setid=68fba58a-7748-4581-8432-f5286c46d90a

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