Urinary tract infections that reach the kidneys and cause back pain always require treatment with antibiotics, according to WebMD. These infections are potentially serious and can move to the blood. Treatment with oral antibiotics is appropriate for mobile patients who are able to take the medication regularly.
Most people with a kidney infection require a seven-day course of antibiotics. Severe infections require intravenous antibiotics and a stay in the hospital, reports WebMD. As the seriousness of the condition improves, the doctor may send the patient home to complete treatment using oral antibiotics. In rare instances, the infections form abscesses, and antibiotics alone are not effective. The doctor may insert a tube through the back into the kidneys to drain the abscess.