I was prescribed keflex for a kidney infection. I experienced DEPRESSION symptoms and felt BLOATED. The drug at times increased.Given my irrational behaviour on keflex, & the. more » I was prescribed keflex for a kidney infection. Cephalexin (Keflex, Keftabs) is an an antibiotic used to treat bacterial infections of the sinuses, tooth, urinary tract, and throat. Common side effects of Keflex include diarrhea, nausea, abdominal pain, headaches, and vaginitis. Dosage of cephalexin depends on the type of infection. User Reviews for Cephalexin to treat Kidney Infections. Also known as: Daxbia, Keflex, Biocef, Zartan, Panixine. The following information is NOT intended to endorse drugs or recommend therapy. Doctors give unbiased, trusted information on the benefits and side effects of Cephalexin to treat Kidney Infection: Dr. Freisleben-Cook on keflex for kidney infection: It depends on the bacteria, patient allergies, and other patient medications. I have never had a kidney infection, so I don't know the symptoms, but my wife suffered from kidney infections for approximately 30 years. About 10 years ago, on a particular day one of our employees remarked that she didn't look very well. A kidney infection is a urinary tract infection that most likely started in your urethra and moved its way up to your kidney(s). The most important thing to realize is that there are many different types of bacteria that could cause the infection. 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 a cephalosporin (SEF a low spor in) antibiotic. It works by fighting bacteria in your body. Keflex is used to treat infections caused by bacteria, including upper respiratory infections, ear infections, skin infections, urinary tract infections, and bone infections.