If you think you or your child may have a urinary tract infection, make sure you or your child drink lots of fluids to help wash out the bacteria. Some UTIs will go away on their own, so while you wait to see, talk to your doctor or pharmacist about over-the-counter medications that help with the pain, burning and urgency. UTI medicines made with phenazopyridine hydrochloride specifically target urinary discomfort and provide relief pretty quickly. If your UTI doesn’t go away within 1 to 2 days, see a doctor. Most UTIs are caused by bacteria, so your doctor will likely prescribe a bacteria-fighting medication (antibiotics or antimicrobials). When a UTI occurs in a healthy person with a normal, unobstructed urinary tract, the antibiotics typically work after 2 or 3 days of treatment. Longer treatment may be needed if the first antibiotic given is not effective or for more severe or chronic cases.