Keflex - Uses - Dosages - Side Effects - Precautions

Keflex: Frequently Asked Questions Answered

What is Keflex?

Keflex or cephalexin is a cephalosporin antibiotic that is used to prevent bacterial infections in humans. The bacterial cell has a thick cell wall that protects it from external environmental stress. The antibiotics prevent the formation of the bacterial cell wall, due to which the bacteria do not survive. Though Keflex is effective against several types of bacteria, it is ineffective against viral infections. In 1971, the Food and Drug Administration (FDA) approved the medical usage of Keflex.

What are the uses of Keflex?

Keflex is prescribed for adults and children who are a minimum of 1-year-old. It is used against numerous species of bacteria like Escherichia coli, Staphylococcus aureus, Streptococcus pneumoniae, and Haemophilus influenzae. Common bacterial infections treated with Keflex are:

  • Throat infections
  • Middle ear infections
  • Bronchitis
  • Pneumonia 
  • Skin infections
  • Urinary tract Infections (UTIs) 

Antibiotics can cause complications depending upon the dosage and quantity. Consult our expert doctors at Yashoda Hospitals before consuming the antibiotics.

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What are the side effects of Keflex?

Before taking the antibiotic, kindly remember to inform your doctor about

  • allergy to penicillin or other drugs (if applicable)
  • liver, heart, or kidney problems
  • gastrointestinal problems
  • possible pregnancy or breastfeeding

Some common side effects of Keflex include:

  • Nausea
  • Diarrhea
  • Headaches 
  • Abdominal upset or pain
  • Vaginal itching 

Allergic reactions can cause fever, fainting, skin rashes, face swelling, shortness of breath, seizures, or cold shivers. In such cases, get emergency medical help at Yashoda Hospitals. Do not self-medicate.


Frequently Asked Questions about Keflex

1. How long does Keflex take to work for a UTI?

The doctor prescribes Keflex treatment for 3 to 7 days. If you've had a minor infection, then the drugs will start to affect you within 1 or 2 days. For severe UTI, you may require at least 4 days of the proper antibiotic course.

2. How long do the side effects of Keflex last?

Keflex does not cause long-lasting side effects, unless you are allergic to it. In such a case, call for immediate medical attention. Common side effects like headache, nausea, and tiredness eventually subside once you finish your medicine and recover.

3. Is Keflex an antibiotic?

Yes, Keflex is a prescribed cephalosporin antibiotic drug. It is used to treat several bacterial infections related to the respiratory and urinary tracts. Keflex is also effective against bone, ear, and skin infections caused by bacteria.

4. Is Keflex penicillin?

Keflex and penicillin antibiotics can treat similar bacterial infections but belong to different classes of drugs. These antibiotics have a similar chemical structure. Therefore, people with penicillin allergies may also be allergic to cephalosporin or Keflex antibiotics.

5. Is Keflex safe during pregnancy?

Keflex is considered safe during pregnancy. However, it is best to consult your gynecologist about the possible infection and the pros and cons before starting any antibiotic. The doctor will prescribe the necessary antibiotic dosage and treatment course depending on your pregnancy situation.

6. Can I have alcohol with Keflex?

Both alcohol and Keflex can cause side effects in your body. Consuming alcohol between your antibiotic treatment may increase the risk of complications such as nausea, stomach upset, drowsiness, and headaches. It is best to avoid alcohol until you finish the antibiotic treatment.

7. Can I take Zyrtec with Keflex?

Zyrtec (antihistamines) and Keflex (antibiotics) do not show any prominent interaction effects. However, it is best to consult your health provider about your allergy history and before mixing the two drugs. Do not consume more than the prescribed dose of both medicines.

8. Does Keflex cause depression?

Prescribed Keflex is associated with common side effects such as restlessness, agitation, dizziness, anxiousness, and headaches. It is best to inform your doctor if you start feeling moody after taking Keflex. Repetitive consumption of certain antibiotics can cause extreme mood swings and affect mental health by inducing chronic anxiety and depression.

9. Is Keflex stronger than Amoxicillin?

Keflex and amoxicillin are both antibiotics of different classes. When appropriate doses are prescribed, they are equally effective against their target group of bacteria. In some cases, Keflex is more efficacious because it can cure bone/joint infections.

10. Can I take Keflex while breastfeeding?

Yes, you can. Keflex is considered safe to use during breastfeeding and does not cause any damaging effects on the baby. If you are unsure, you can consult your gynecologist or a pediatrician before taking the antibiotics.

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Disclaimer: The information provided herein is accurate, updated and complete as per the best practices of the Company. Please note that this information should not be treated as a replacement for physical medical consultation or advice. We do not guarantee the accuracy and the completeness of the information so provided. The absence of any information and/or warning to any drug shall not be considered and assumed as an implied assurance of the Company. We do not take any responsibility for the consequences arising out of the aforementioned information and strongly recommend you for a physical consultation in case of any queries or doubts.