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Many doctors prescribe cephalexin for UTI treatment. 


The typical dose of cephalexin for an adult with a UTI is a total of 1-4 grams per day taken in divided doses. Typically, the prescription is written as 250 mg every six hours, or 500 mg every 12 hours. 

Side Effects

Anyone taking cephalexin for a UTI should stay well-hydrated. In addition to the possible side effects of cephalexin (including nausea, vomiting, diarrhea, fatigue, dizziness, headaches, stomach pain, heartburn, and rectal or genital itching), they may also notice other signs and symptoms associated with a UTI, including pain with urination or blood in the urine.

Severe diarrhea caused by a bacteria called Clostridium difficile is a potential side effect of any antibiotic taken for any reason, including cephalexin for UTI treatment. Symptoms of a C. diff infection include persistent, watery, or even bloody diarrhea. (if you are experiencing bloody diarrhea or urine always seek medical help immediately as it may be a sign of other problems)

To learn more, please visit our page on cephalexin side effects.

Disclaimer: this article does not constitute or replace medical advice. If you have an emergency or a serious medical question, please contact a medical professional or call 911 immediately. To see our full medical disclaimer, visit our Terms of Use page.

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