Keflex Generic (Cephalexin): Mechanism of Action, Cost, Adverse Effects

Keflex is an antibiotic that is often considered to be a first-line option for the treatment of infections in the lungs, ears, and throat. Keflex works by inhibiting the synthesis of proteins required for growth and replication of bacteria. This results in the death of the bacteria within 24 to 48 hours after administration.

There are several reasons why you should use Keflex for the treatment of your bacterial infection: it is widely available, relatively inexpensive, and well-tolerated by most patients. In addition, Keflex has been shown to be effective in treating a wide range of bacterial species, including some resistant strains.

How it Works

This drug works by preventing the bacteria from forming the cell walls that are essential for their growth. Without these cell walls, the bacteria are unable to survive. This makes Keflex an ideal drug for treating infections.

Keflex is effective against a wide variety of bacteria, which includes both Gram-positive and -negative strains. It can be used to treat infections such as bronchitis, pneumonia, skin infections, and bladder infections.

What Conditions Keflex Treats

Keflex is an antibiotic that is used to treat a variety of conditions, including sinus infections, strep throat, pneumonia, and Lyme disease.

Keflex is a powerful antibiotic that can be used to treat a variety of conditions, including sinus infections, strep throat, pneumonia, and Lyme disease. This drug kills the bacteria that is causing the infection, which helps to relieve the symptoms and speed up the healing process.

Cost of Keflex Generic and Brand

Available as a branded and generic antibacterial antibiotic medication, Keflex (Cephalexin) comes in the form of tablets and capsules of 250mg and 500mg. The average retail price of 90 capsules of branded Keflex 250mg is $45.99, while 105 capsules of generic Keflex (Cephalexin) 500mg manufactured in India will cost around $65. The cost of this medication may vary depending on the producing country, the manufacturer company, the pharmacy, and the patient’s insurance coverage.

Keflex (brand)

  • Keflex 500mg: available in the quantity of 90 capsules, branded Keflex 500mg manufactured in India will cost $45.99 per package or $0.51 per unit.

Keflex (generic, Cephalexin)

  • Cephalexin 250mg: available in the quantity of 100 tablets, generic Keflex from Canadian pharmacy (Cephalexin) 250mg manufactured in India will cost $53.99 per package or $0.54 per unit.
  • Cephalexin 500mg: available in the quantity of 105 capsules, generic Keflex (Cephalexin) 500mg manufactured in India will cost $64.99 per package or $0.62 per unit.

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How to Get the Most Out

If you’re looking to get the most out of your Keflex, here are a few tips that can help:

  1. Take it exactly as prescribed. The dosage and duration of treatment may vary depending on the type of infection you have and its severity, but it’s important to follow your doctor’s orders to the letter.
  2. Watch out for side effects. Like any drug, Keflex causes side effects in some people. The most common ones include nausea, dyspepsia, diarrhea, and rash. If you experience any of these, let your doctor know right away.
  3. Stay hydrated. It’s important to drink plenty of fluids while taking Keflex in order to stay hydrated and avoid dehydration. This will help your body absorb the medication better and reduce the risk of side effects.
  4. Get plenty of rest. When you’re sick with an infection, it’s easy to neglect yourself and push through the pain. But this is not only dangerous, it can also make your symptoms worse. Make sure to get plenty of rest and take time to recover from your illness.

Side Effects

If you’re taking Keflex, it’s important to take steps to avoid side effects.

There are a few things you can do to avoid side effects from Keflex. First, take the medication with a full glass of water. Second, take the medication with food if possible. And third, try to space out your doses throughout the day rather than taking them all at once.

If you still experience side effects from Keflex, talk to your doctor about adjusting your dosage or trying a different medication.

Drug Interactions

Keflex is typically well-tolerated, but like all medications, it can cause side effects and drug interactions.

One potential drug interaction with Keflex is with the anticoagulant medication warfarin. Warfarin works by inhibiting the clotting factors in your blood, which can lead to an increased risk of bleeding. If you are taking Keflex and warfarin together, your doctor will closely monitor your blood clotting time.

Another potential drug interaction is with metformin, which is used in the treatment of type 2 diabetes. Metformin can increase the levels of Keflex in your blood, which can lead to side effects such as severe nausea and diarrhea. If you are taking Keflex and metformin together, your doctor will likely monitor your Keflex levels and adjust your dose accordingly.

As with any medication, it’s important to be aware of potential drug interactions before starting Keflex.

Pregnancy and Keflex

There are many things to consider when you’re pregnant, and one of them is the use of medication. It’s important to talk to your doctor about any medications you’re taking, including Keflex. This is a type of antibiotic that may be prescribed for you during pregnancy.

There are some risks associated with taking Keflex during pregnancy, but these risks are generally low. Your doctor will likely recommend that you avoid taking Keflex in the first trimester. After that, it’s usually safe to continue taking the medication unless your doctor advises otherwise.

If you do decide to take Keflex while you’re pregnant, be sure to use it only as directed by your doctor. And remember that any time you take any medication, there’s always a potential risk involved. So always make sure to talk to your doctor before making any decisions about taking Keflex during pregnancy.


There are many questions about Keflex that people often ask their doctors or pharmacists. Here are some of the most common ones:

How long does it take for Keflex to begin working?

It takes about 30-60 minutes for Keflex to start working, but this can vary from person to person. The length of time it takes for Keflex to work depends on the type of infection you have and the dosage of the medication. With some infections, Keflex may take up to 24 hours to start working.

Can I take Keflex with other medications?

Yes, you can take Keflex with other medications. However, like all medications, there are some potential interactions that you should be aware of when taking Keflex. These include:

  • tetracycline antibiotics (such as demeclocyline, doxycycline, and minocycline)
  • probenecid
  • penicillins (such as amoxicillin and ampicillin)
  • antacids containing magnesium or aluminium hydroxide

What side effects can Keflex have on a fetus or nursing infant?

Keflex can pass through breast milk and possibly harm a nursing infant. Therefore, you should not breastfeed while taking this medication. If you are pregnant, talk to your doctor about other options for treating your condition.

Can I give Keflex to my dog or cat?

Yes, you can give Keflex to your dog or cat. It is a commonly used to treat both dogs and cats. However, it is important to note that Keflex is not approved for use in animals under the age of eight weeks old. Additionally, it is important to monitor your pet’s condition while on Keflex, as there have been reports of adverse reactions in some animals. If you do decide to give your pet Keflex, be sure to follow the directions on the package carefully and contact your veterinarian if you have any questions or concerns.

Consumer information and Disclaimer

The information we provide on this page is not intended to substitute a physical examination and a consultation in your doctor’s office followed with the prescription of the best-suited medicating. Furthermore, this information may appear incomplete, partial, non-specific and otherwise unfitted to be used as the recommendation basis for any type of treatment. We try to create scientifically accurate copies that go through multiple checkpoints and are curated by professionals, but we reserve the right for occasional errors. Seek doctor’s advice before commencing, renewing or discontinuing any drug. The same concerns recommendations and best practices for drug application, effects, caution and adverse reactions.