Introduction

If you’ve been diagnosed with a urinary tract infection (UTI), your doctor may have prescribed an antibiotic called Keflex. An antibiotic is a medication used to treat infections caused by bacteria. Keflex is more often prescribed in its generic version, called cephalexin. This article can help you understand more about UTIs and what you can expect from treatment with Keflex or cephalexin.

Keflex and UTIs

If your doctor prescribes Keflex to treat your UTI, you’ll likely take the drug at home. Treatment usually lasts seven to 14 days.

As with all antibiotics, you should take Keflex exactly as your doctor prescribes. Take the entire course of treatment even if you start to feel better. Never stop treatment early. If you do, the infection could return and get worse. Also, be sure to drink plenty of fluids during your treatment.

About Keflex

Keflex is a brand-name drug that’s also available as the generic drug cephalexin. Keflex belongs to a class of drugs called cephalosporins, which are antibiotics. These drugs are often used to treat infections of the bladder or kidneys.

Keflex is used in adults to treat several types of bacterial infections, including UTIs. It’s available as a capsule you take by mouth. It works by stopping bacterial cells from forming properly.

Common side effects

The more common side effects of Keflex can include:

  • diarrhea
  • upset stomach
  • dizziness
  • tiredness
  • headache
  • confusion

Serious side effects

In some cases, Keflex can cause serious side effects. These can include:

Serious allergic reaction

Symptoms can include:

  • hives or rash
  • trouble breathing or swallowing
  • swelling of your lips, tongue, or face
  • throat tightness
  • a rapid heart rate

Liver damage

Symptoms can include:

  • nausea
  • vomiting
  • pain or tenderness in your abdomen
  • fever
  • dark urine
  • yellowing of your skin or the whites of your eyes

Other infections

Keflex will kill only certain types of bacteria, so other types may continue to grow and cause other infections. Your doctor can tell you more. Symptoms of infections can include:

  • fever
  • body aches
  • tiredness

Drug interactions

An interaction is when a substance changes the way a drug works. This can be harmful or prevent the drug from working well. Before starting Keflex, tell your doctor about all medications, vitamins, or herbs you’re taking. This can help your doctor prevent possible interactions.

Examples of drugs that can interact with Keflex include probenecid and birth control pills.

Other health conditions of concern

Keflex may not be a good choice if you have certain health conditions. Be sure to discuss your health history with your doctor before they prescribe Keflex or any other drug to treat your UTI. Examples of conditions that could cause problems with Keflex include kidney disease and allergies to penicillin or other cephalosporins.

Pregnancy and breastfeeding

Keflex is a category B pregnancy drug. If you’re pregnant, talk with your doctor to see if this drug is safe for you.

Keflex can pass to a child through breast milk. If you breastfeed your child, talk with your doctor about whether you should stop breastfeeding or if you should take a different drug for your UTI.

Learn more: Side effects, dosage, and interactions for cephalexin (Keflex) »

About UTIs

Urinary tract infections (UTIs) are typically caused by bacteria. These infections can occur anywhere in your urinary tract, including your kidneys, bladder, or urethra. (Your urethra is the tube that carries urine from your bladder out of your body.)

The bacteria that cause a UTI can come from your skin or your rectum. These germs travel into your body through your urethra. If they move into your bladder, the infection is called bacterial cystitis. In some cases, the bacteria move from the bladder into the kidneys. This causes a much more serious condition called pyelonephritis, which is inflammation of the kidneys and surrounding tissue.

Women are more likely than men to get UTIs. This is because a woman’s urethra is shorter than a man’s, which makes it easier for bacteria to reach the bladder.

UTI symptoms

The more common symptoms of a UTI can include:

  • pain or burning during urination
  • frequent urination
  • feeling an urge to urinate even if your bladder is empty
  • a fever between 98.7°F and 101°F (37.05°C and 38.3°C)
  • cloudy or bloody urine
  • pressure or cramping in your lower abdomen

Symptoms of pyelonephritis include:

  • pain in your lower back or side
  • a fever greater than 101°F (38.3°C)
  • nausea or vomiting
  • delirium (severe confusion)
  • chills

If you notice any symptoms of a UTI, call your doctor. Call them right away if you have symptoms of pyelonephritis.

Your doctor will likely order a urine test to confirm that you have a UTI before treating you. This is because UTI symptoms can be similar to symptoms caused by other problems. If the test results show that you have a UTI, your doctor will likely prescribe an antibiotic such as Keflex.

Talk with your doctor

Keflex is one of several antibiotics that can be used to treat UTIs. Your doctor will choose the best one for you based on your health history, other drugs you’re taking, and other factors.

If your doctor prescribes Keflex, they can tell you more about this drug. Discuss this article with your doctor and ask any questions you have. The more you know about your treatment options, the more comfortable you’ll likely feel with your care.