dosage of cephalexin for urinary tract infection

3 min read 16-03-2025

Meta Description: Learn about the typical dosage of cephalexin for urinary tract infections (UTIs). This comprehensive guide explains how cephalexin works, potential side effects, and important considerations. We'll cover adult and child dosages, as well as what to do if you miss a dose. Don't start or stop taking cephalexin without consulting your doctor.

Cephalexin is a common antibiotic used to treat various bacterial infections, including urinary tract infections (UTIs). However, it's crucial to understand that this article is for informational purposes only and should not be considered medical advice. Always consult your doctor or other qualified healthcare professional before starting or changing any medication, including cephalexin. They can determine the appropriate dosage and treatment plan based on your specific needs and medical history.

Understanding Cephalexin and UTIs

A urinary tract infection (UTI) occurs when bacteria infect any part of your urinary system – your kidneys, ureters, bladder, or urethra. UTIs are more common in women. Cephalexin works by stopping the growth of bacteria causing the infection. It's a first-line treatment option for many uncomplicated UTIs. However, its effectiveness depends on the specific type of bacteria causing the infection.

Cephalexin Dosage for Adults

The typical adult dosage of cephalexin for a UTI is 250-500 milligrams (mg) taken every 6-12 hours, as prescribed by your doctor. The exact dosage and frequency will depend on the severity of your infection and your overall health. Treatment usually lasts for 7-14 days. Never adjust the dosage or duration of treatment without consulting your physician.

What if I Miss a Dose?

If you miss a dose of cephalexin, take it as soon as you remember, unless it's almost time for your next dose. Do not take a double dose to make up for a missed one.

Cephalexin Dosage for Children

Cephalexin is sometimes prescribed for children with UTIs. However, the dosage is carefully calculated based on the child's weight and age. Never give a child cephalexin without a doctor's prescription and explicit instructions. The doctor will determine the appropriate dose and administration method (oral suspension is common for children).

Potential Side Effects of Cephalexin

Like all medications, cephalexin can cause side effects. These are usually mild but can include:

Nausea and vomiting: These are relatively common side effects.
Diarrhea: In some cases, cephalexin can cause diarrhea, which may be a sign of a Clostridium difficile infection (a serious condition).
Stomach cramps: Abdominal discomfort is another possibility.
Rash or itching: Allergic reactions, ranging from mild rashes to severe anaphylaxis, are possible.
Yeast infections: Cephalexin can disrupt the natural balance of your gut flora, leading to yeast infections.

Severe allergic reactions are rare but require immediate medical attention. Symptoms include difficulty breathing, swelling of the face, lips, or tongue, and hives.

Important Considerations

Tell your doctor about all medications you are taking, including over-the-counter drugs and supplements, as some may interact with cephalexin.
Inform your doctor about any allergies you have.
Complete the full course of antibiotics, even if you feel better before the medication is finished. This helps prevent the infection from returning.
Drink plenty of fluids while taking cephalexin to help flush out the bacteria.
Do not take cephalexin if you are allergic to penicillin or other cephalosporin antibiotics.

When to Seek Immediate Medical Attention

Contact your doctor immediately if you experience any severe side effects, such as:

Severe allergic reactions (difficulty breathing, swelling, hives)
Severe diarrhea
Signs of kidney problems (reduced urine output, swelling)
Persistent nausea or vomiting

This information is not a substitute for professional medical advice. Always consult your doctor before starting or stopping any medication. They can provide personalized guidance on the appropriate dosage of cephalexin for your specific situation and monitor your progress during treatment.