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Update Date 08/05/2020 . 4 mins read
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What is Keflor® (cefaclor) used for?

Cefaclor is a cephalosporin antibiotic. It kills sensitive bacteria by interfering with formation of the bacteria’s cell wall while it is growing.

Keflor® is commonly used for treating infections caused by certain bacteria.

How should I take Keflor® (cefaclor)?

To use this drug,

  • Cefaclor may be taken with or without food.
  • Chew thoroughly before swallowing.
  • To clear up your infection completely, continue using cefaclor for the full course of treatment, even if you feel better in a few days.
  • Cefaclor works best if it is taken at the same time(s) each day.

Ask your health care provider any questions you may have about how to use cefaclor.

How do I store Keflor® (cefaclor)?

Keflor® is best stored at room temperature away from direct light and moisture. To prevent drug damage, you should not store Keflor® in the bathroom or the freezer. There may be different brands of Keflor® that may have different storage needs. It is important to always check the product package for instructions on storage, or ask your pharmacist. For safety, you should keep all medicines away from children and pets.

You should not flush Keflor® down the toilet or pour them into a drain unless instructed to do so. It is important to properly discard this product when it is expired or no longer needed. Consult your pharmacist for more details about how to safely discard your product.

Precautions & warnings

What should I know before using Keflor® (cefaclor)?

Before using this drug, tell your doctor if you have:

  • Allergic to any ingredient in cefaclor or any other cephalosporin antibiotic (e.g., cephalexin)
  • Taking any prescription or nonprescription medicine, herbal preparation, or dietary supplement
  • Allergies to medicines, foods, or other substances
  • Diarrhea, a stomach infection, or a blood clotting disorder
  • Phenylketonuria
  • A severe allergic reaction (e.g., a severe rash, hives, breathing difficulties, dizziness) to a penicillin antibiotic (e.g., amoxicillin) or other beta-lactam antibiotic (e.g., imipenem)

Is it safe during pregnancy or breastfeeding?


If you plan on becoming pregnant, discuss with your doctor the benefits and risks of using cefaclor during pregnancy.


Cefaclor is excreted in breast milk. If you are or will be breastfeeding while you are using cefaclor, check with your doctor or pharmacist to discuss the risks to your baby.

Side effects

What side effects can occur from Keflor® (cefaclor)?

These side effects may occur when using this drug, including:

Seek medical attention right away if any of these severe side effects occur:

  • Rash
  • Hives
  • Difficulty breathing
  • Tightness in the chest
  • Swelling of the mouth, face, lips, or tongue
  • Itching
  • Bloody stools
  • Fever
  • Seizures
  • Severe diarrhea
  • Stomach cramps/pain
  • Urge to have a bowel movement
  • Vaginal irritation or discharge

Not everyone experiences these side effects. There may be some side effects not listed above. If you have any concerns about a side-effect, please consult your doctor or pharmacist.


What drugs may interact with Keflor® (cefaclor)?

Keflor® may interact with other drugs that you are currently taking, which can change how your drug works or increase your risk for serious side effects. To avoid any potential drug interactions, you should keep a list of all the drugs you are using (including prescription drugs, nonprescription drugs, and herbal products) and share it with your doctor and pharmacist. For your safety, do not start, stop, or change the dosage of any drugs without your doctor’s approval.

Products may interact with this drug, including:

  • Probenecid because it may increase the actions and side effects of cefaclor.
  • Oral anticoagulants (e.g., warfarin) because side effects, including risk of bleeding, may be increased by cefaclor.

Does food or alcohol interact with Keflor® (cefaclor)?

Keflor® may interact with food or alcohol by altering the way the drug works or increase the risk for serious side effects. Please discuss with your doctor or pharmacist any potential food or alcohol interactions before using this drug.

What health conditions may interact with Keflor® (cefaclor)?

Keflor® may interact with your health condition. This interaction may worsen your health condition or alter the way the drug works. It is important to always let your doctor and pharmacist know all the health conditions you currently have.


The information provided is not a substitute for any medical advice. You should ALWAYS consult with your doctor or pharmacist before using Keflor® (cefaclor).

What is the dose of Keflor® (cefaclor) for an adult?

The usual adult dosage is 250 mg every 8 hours.

For more severe infections (such as pneumonia) or those caused by less susceptible organisms, doses may be doubled.

Take Keflor® 250 mg capsule orally 2 to 3 times daily.

What is the dose of Keflor® (cefaclor) for a child?

The usual recommended daily dosage for pediatric patients is 20 mg/kg/day in divided doses every 8 hours.

In more serious infections, otitis media, and infections caused by less susceptible organisms, 40 mg/kg/day are recommended, with a maximum dosage of 1 g/day.

How is Keflor® (cefaclor) available?

Keflor® is available in the following dosage forms and strengths:

  • Keflor® 250 mg capsule

What should I do in case of an emergency or overdose?

In case of an emergency or an overdose, call your local emergency services or go to your nearest emergency room.

What should I do if I miss a dose?

If you miss a dose of Keflor®, take it as soon as possible. However, if it is almost time for your next dose, skip the missed dose and take your regular dose as scheduled. Do not take a double dose.


Keflor®. Accessed November 23, 2016

Cefaclor. Accessed November 23, 2016.

Hello Health Group does not provide medical advice, diagnosis or treatment.

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