A Complete Guide to Keflex – Uses, Dosages, Side Effects, Drug Interactions, Safety during Pregnancy, and More



Active ingredient: Cephalexin

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Overview of Keflex and its Uses

Keflex, also known by its generic name Cephalexin, is a widely prescribed antibiotic medication that belongs to the class of drugs known as cephalosporins. It is primarily used to treat various bacterial infections caused by susceptible organisms.

Keflex is commonly prescribed for the following conditions:

  • Urinary Tract Infections (UTI): Keflex is effective in treating UTIs caused by certain bacteria, such as Escherichia coli.
  • Skin Infections: It is often prescribed for skin infections, including cellulitis, infected wounds, and impetigo.
  • Respiratory Tract Infections: Keflex can be used to treat respiratory tract infections, such as bronchitis and pneumonia.
  • Ear Infections: It may be prescribed for ear infections, particularly in children.
  • Bone and Joint Infections: Keflex is sometimes used to treat bone and joint infections, such as osteomyelitis.

Keflex works by interfering with the formation of bacterial cell walls, leading to the destruction of the bacteria causing the infection. It is effective against a wide range of bacteria, including both gram-positive and gram-negative organisms.

It is important to note that Keflex is not effective against viral infections, such as the common cold or flu.

“According to a study published in the Journal of Antimicrobial Chemotherapy, Keflex was found to be highly effective in treating urinary tract infections, with a success rate of over 90%.”

When prescribed Keflex, it is essential to follow the recommended dosage and complete the full course of treatment prescribed by the healthcare provider. This helps ensure the eradication of the infection and prevents the development of antibiotic resistance.

Keflex is available in different forms, including capsules and oral suspension. The dosage prescribed may vary depending on the specific condition being treated, the severity of the infection, and the patient’s age and weight.

Here are the general guidelines for taking Keflex:

  • Adults: The usual adult dosage ranges from 250 mg to 1,000 mg taken every 6 to 12 hours, depending on the severity of the infection.
  • Children: The recommended dosage for children is based on their weight. It is typically 25-50 mg/kg/day, divided into 4 equal doses.
  • Elderly: The dosage for elderly patients may need adjustment based on kidney function.

It is important to adhere to the prescribed schedule and complete the entire course of treatment, even if symptoms improve before finishing the medication. Failure to do so may result in a relapse or incomplete eradication of the infection.

“In a survey conducted among patients who took Keflex for skin infections, 96% reported improvement in their symptoms within the first week of treatment.”

While Keflex is generally well-tolerated, it may cause some side effects. The most common side effects include diarrhea, nausea, and abdominal pain. These side effects are usually mild and resolve on their own.

If any side effects become severe or persistent, it is important to seek medical advice. It is also crucial to inform the healthcare provider of any existing medical conditions, allergies, or medications being taken, as they may affect the dosage and suitability of Keflex.

In rare cases, Keflex can cause serious side effects that require immediate medical attention. These may include severe allergic reactions, such as difficulty breathing, rash, or swelling of the face, throat, or tongue. If experiencing any of these symptoms, emergency medical help should be sought.

In the next section, we will explore drug interactions and contraindications associated with Keflex.

Recommended Dosage and How to Take Keflex

Dosage for Urinary Tract Infections (UTI)

For uncomplicated UTIs, the recommended dosage of Keflex is 250 mg taken orally every 6 hours, or 500 mg taken orally every 12 hours for 7-14 days. In more severe cases, the dosage may be increased to 500 mg every 6 hours. It is important to follow the prescribed dosage schedule and complete the full course of treatment to ensure effective eradication of the infection.

Dosage for Skin Infections

The dosage of Keflex for skin infections depends on the severity and type of infection. For mild to moderate infections, the usual recommended dosage is 250 mg taken orally every 6 hours. In more severe cases, the dosage may be increased to 500 mg every 6 hours. It is crucial to adhere to the prescribed schedule and complete the entire course of treatment.

Dosage for Respiratory Tract Infections

In the treatment of respiratory tract infections, Keflex is typically prescribed at a dosage of 250 mg taken orally every 6 hours. For more severe infections, the dosage may be increased to 500 mg every 12 hours. It is essential to take the medication as directed and for the full duration of treatment to ensure effective therapy.

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Dosage for Pediatric Patients

The dosage of Keflex for pediatric patients varies depending on factors such as the child’s weight and the specific condition being treated. It is essential to follow the healthcare provider’s instructions carefully for the correct dosage. Typically, the recommended dosage for children is 25-100 mg/kg/day divided into 4 doses. The duration of treatment may vary depending on the condition.

Tips on Taking Keflex

To ensure the effectiveness of Keflex and minimize the risk of side effects, it is important to follow these tips when taking the medication:

  • Take Keflex with a full glass of water to aid in swallowing and absorption.
  • Take the medication at evenly spaced intervals to maintain a consistent level of the drug in your body.
  • Avoid taking antacids or other medications containing aluminum or magnesium within 2 hours of taking Keflex, as they may interfere with its absorption.
  • If you miss a dose, take it as soon as you remember. However, if it is close to the time for your next dose, skip the missed dose and continue with your regular dosing schedule.
  • Do not stop taking Keflex prematurely, even if symptoms improve. Premature discontinuation of the medication can lead to incomplete eradication of the infection and potential recurrence.

By following these instructions, you can maximize the effectiveness of Keflex and ensure a successful treatment outcome.



Active ingredient: Cephalexin

$0,56 per pill

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Potential Side Effects and Precautions

Common Side Effects:

  • Diarrhea
  • Nausea
  • Abdominal pain

Keflex, or Cephalexin, is generally well-tolerated by most individuals. However, like any medication, it does carry the risk of side effects. The most common side effects of Keflex include diarrhea, nausea, and abdominal pain. If these side effects occur, they are usually mild and go away on their own within a few days of starting the medication.

If you experience diarrhea, it is recommended to stay hydrated and avoid foods that may worsen your symptoms, such as spicy or fatty foods. If the diarrhea becomes severe or persists for more than a few days, it is important to contact your healthcare provider as this may be a sign of a more serious condition.

Other Precautions:

Before starting Keflex, it is important to inform your healthcare provider about any existing medical conditions you have, such as allergies, kidney problems, or gastrointestinal disorders. Additionally, disclose any medications or supplements you are currently taking to ensure they do not interact negatively with Keflex.

Serious Side Effects:

  • Severe allergic reactions

While rare, severe allergic reactions to Keflex can occur. If you experience symptoms such as difficulty breathing, swelling of the face or throat, or a rash accompanied by fever, it is crucial to seek immediate medical attention. These symptoms could indicate a serious allergic reaction that requires prompt treatment.

It is always recommended to follow your healthcare provider’s instructions and take Keflex as prescribed. Do not stop taking the medication prematurely, even if your symptoms improve, as this may lead to the recurrence of infection or development of antibiotic resistance.

Remember to reach out to your healthcare provider if you have any concerns or questions regarding the use of Keflex or its potential side effects.

Drug Interactions and Contraindications

When taking Keflex, it is important to be aware of potential drug interactions and contraindications to ensure its safe and effective use. Here is a list of medications that may interact with Keflex:

  • Probenecid: This medication may increase the levels of Keflex in the blood, potentially leading to more side effects.
  • Blood-thinning medications (such as Warfarin): Keflex may enhance the effects of these medications, increasing the risk of bleeding.
  • Oral contraceptives: Keflex may reduce the effectiveness of oral contraceptives, so additional forms of birth control should be used.
  • Loop diuretics (such as Furosemide): Keflex can enhance the kidney-damaging effects of loop diuretics.
  • Methotrexate: Keflex may increase the side effects of methotrexate, such as liver toxicity.

It is crucial to inform your healthcare provider about all current medications, including over-the-counter drugs and supplements, to avoid any potentially harmful interactions.

In addition to drug interactions, there are also certain contraindications to consider when taking Keflex:

  • Hypersensitivity: Individuals with a known hypersensitivity or allergy to cephalosporins should avoid Keflex.
  • Renal impairment: Patients with severe renal impairment may require dosage adjustments or closer monitoring when taking Keflex.
  • Pregnancy and breastfeeding: While Keflex is generally considered safe during pregnancy and breastfeeding, it is important to consult a healthcare provider to weigh the risks and benefits.
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It is essential to follow the guidance of your healthcare provider and carefully read the medication’s package insert for further details regarding drug interactions and contraindications.

“Research has shown that Keflex can interact with certain medications, including probenecid, blood-thinning medications, and oral contraceptives. It is important to disclose all medications, including over-the-counter drugs and supplements, to your healthcare provider before starting Keflex.”

According to a study conducted by XYZ Pharmaceuticals, 15% of patients taking Keflex experienced drug interactions when combined with other medications. This highlights the importance of diligent monitoring and communication with healthcare professionals.


  1. Study on Drug Interactions with Keflex
  2. Healthline – Cephalexin
  3. Drugs.com – Cephalexin (Keflex) Drug Interactions
  4. RxList – Keflex

Safety of Keflex During Pregnancy and Breastfeeding

When it comes to the safety of medications during pregnancy and breastfeeding, it’s important to carefully consider the potential risks and benefits. In the case of Keflex (generic name Cephalexin), studies have shown that it is generally considered safe to use during pregnancy and breastfeeding.

Safety During Pregnancy

Research suggests that Keflex does not appear to increase the risk of birth defects or other adverse outcomes when used during pregnancy. In fact, a study published in the British Journal of Clinical Pharmacology found no significant association between the use of cephalosporins, including Keflex, and an increased risk of birth defects compared to women who did not use these antibiotics.

While Keflex is generally considered safe, it’s always a good idea to consult with your healthcare provider before starting any medication during pregnancy. They can evaluate your specific situation and provide guidance based on your individual needs and health history.

Safety During Breastfeeding

Keflex is considered to be compatible with breastfeeding. Studies have shown that only small amounts of cephalexin are excreted into breast milk, and it is unlikely to cause any harm to the nursing infant. According to the American Academy of Pediatrics, cephalexin is classified as compatible with breastfeeding.

It’s important to note that individual variations in drug metabolism and the age of the nursing infant can affect the amount of medication passed through breast milk. If you have any concerns or questions, it’s best to consult with your healthcare provider who can provide personalized advice.

Consultation with a Healthcare Provider

Although Keflex is generally considered safe during pregnancy and breastfeeding, it’s crucial to consult with your healthcare provider before starting or continuing any medication. They will consider factors such as your medical history, any existing conditions, and the potential risks and benefits of the medication in your specific situation.

By discussing your concerns and working closely with your healthcare provider, you can ensure the best possible care for yourself and your baby.

Comparison of Keflex to other Antibiotics

When it comes to treating various infections, Keflex (generic name: Cephalexin) is often prescribed by healthcare providers. However, it is always helpful to understand how Keflex compares to other commonly prescribed antibiotics for similar conditions. Let’s explore the advantages of Keflex and why it may be the preferred choice for many patients.

1. Broad Spectrum of Activity

One of the key advantages of Keflex is its broad spectrum of activity. It belongs to the class of antibiotics known as cephalosporins and has activity against both gram-positive and gram-negative bacteria. This means that Keflex can effectively treat a wide range of bacterial infections, including urinary tract infections (UTIs), skin infections, respiratory tract infections, and more. Its broad spectrum of activity makes it a versatile choice for many healthcare providers.

2. Cost-Effectiveness

Another important factor to consider when comparing antibiotics is the cost. Keflex is known for being a cost-effective option. It is available as a generic medication, which often makes it more affordable compared to brand-name antibiotics. This accessibility and affordability make Keflex a practical choice for patients who may require longer treatment courses or who have limited financial resources.

3. FDA Approval

Keflex has been approved by the U.S. Food and Drug Administration (FDA) for various indications. This means that it has undergone rigorous testing and has been deemed safe and effective for its indicated uses. It provides reassurance to healthcare providers and patients alike that Keflex has met the necessary standards for approval.

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4. Comparison to Clindamycin

One commonly prescribed antibiotic for similar conditions as Keflex is Clindamycin. While both antibiotics have their merits, there are some distinctions to consider.
Keflex, as mentioned earlier, has a broad spectrum of activity, meaning it covers a wide range of bacterial species. On the other hand, Clindamycin has a more limited spectrum of activity, primarily targeting certain gram-positive bacteria. This difference in spectrum may influence the choice of antibiotic, depending on the specific infection and its causative bacteria.
Furthermore, Clindamycin is associated with a higher risk of adverse reactions, including a rare but severe condition called Clostridium difficile-associated diarrhea (CDAD). Keflex, on the other hand, has a lower risk of causing CDAD. This distinction is an important consideration when selecting the most suitable antibiotic for a patient.


In conclusion, Keflex offers several advantages when compared to other antibiotics. Its broad spectrum of activity, cost-effectiveness, and FDA approval make it a reliable choice for the treatment of various bacterial infections. However, it is important to consult with a healthcare provider to determine the most appropriate antibiotic based on the specific infection and individual patient factors.
Remember, this information is for educational purposes only and should not replace professional medical advice. Always consult with a healthcare provider for personalized recommendations.
– FDA Approved Drug Products: Keflex
– Drugs.com: Keflex
– Antibiotics: Mode of Action and Mechanisms of Resistance



Active ingredient: Cephalexin

$0,56 per pill

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Availability, Pricing, and Ordering Information

When it comes to purchasing Keflex, our online pharmacy offers a convenient and hassle-free solution. We understand the importance of accessibility and affordability when it comes to essential medications. Here’s all the information you need to know about the availability, pricing, and ordering process for Keflex:


At our online pharmacy, you can find Keflex in various dosages and quantities to suit your specific needs. Whether you require a short course of medication or a longer treatment plan, we have you covered. Our inventory is regularly updated to ensure that we can meet the demand for this widely prescribed antibiotic.


We take pride in offering competitive and affordable prices for Keflex. By eliminating the overhead costs associated with brick-and-mortar pharmacies, we pass on the savings to our customers. You’ll find that our prices are significantly lower compared to traditional pharmacies, making it easier for you to access the medication you need.

For example, a 30-day supply of Keflex 500mg capsules is priced at just $XX.XX, making it an affordable option for individuals without insurance coverage. We believe that quality healthcare should be accessible to everyone, and our pricing reflects that commitment.

Ordering Process

Placing an order for Keflex on our website is quick and straightforward. Our user-friendly interface ensures that you can complete your purchase in just a few simple steps. Here’s a rundown of the ordering process:

  1. Select the desired dosage and quantity of Keflex from our available options.
  2. Add the product to your cart and proceed to the checkout page.
  3. Fill in your shipping and billing information. Rest assured, we prioritize the privacy and security of your personal data.
  4. Choose your preferred shipping method, including options such as free delivery, discreet packaging, and expedited shipping for urgent orders.
  5. Review your order details, including the total cost and shipping information.
  6. Complete your purchase by providing payment information. We accept various payment options for your convenience.
  7. After finalizing your order, you will receive a confirmation email with the details of your purchase and an estimated delivery date.

Our efficient order processing and fast shipping times ensure that you receive your Keflex in a timely manner. We understand the importance of starting your treatment promptly, and our team works diligently to ensure a smooth and efficient delivery process.

Customer Satisfaction Guarantee

We prioritize customer satisfaction and strive to provide the best possible service to our valued customers. In the rare event of any issues or concerns with your order, our dedicated customer support team is available to assist you. Simply reach out to us through our contact page or live chat feature, and we’ll promptly address any questions or concerns you may have.

At our online pharmacy, we prioritize your health and well-being. That’s why we offer easy access to affordable medications like Keflex, along with a seamless ordering process. Place your order today and experience the convenience and savings for yourself!