Uncomplicated Urinary Tract Infection

A 30-year-old woman calls you to report a 2-day history of worsening dysuria and urinary urgency and frequency. She reports having no fever, chills, back pain, or vaginal irritation or discharge. One month ago, you treated her with a 3-day course of trimethoprim-sulfamethoxazole for presumptive cystitis, and her symptoms resolved. She is otherwise healthy, but this is her third episode in the past year. How should her case be managed?