Recurrent urinary tract infections are defined as three or more episodes of urinary tract infection in a year or two episodes of urinary tract infection within six months. Prevention with antibiotics or other methods is positive. Prophylactic antibiotics applied once a day or only after intercourse can reduce the frequency of recurrent urinary tract infections in women with frequent intercourse, and the side effects of antibiotic application are generally mild. The prophylactic antibiotics usually used include sulfonamides such as furantoin and cephalosporins such as cephalexin. Furantoin has the highest discontinuation rate, followed by cefadroxil. Post-coital prophylaxis has the same effect as daily intake. It is contraindicated in pregnant women. Regarding the application of other prophylactic measures, some studies have shown that orange juice is effective in reducing the rate of recurrence of urinary tract infections, but not in treating them. There is no definitive basis for exactly how much is optimal to drink daily. The latest information: sodium hyaluronate (Cistercian) bladder instillation, the efficacy is certain. Usual precautions: 1. Etiology Urinary tract infections are often caused by bacteria and require antibiotic treatment. 2.Treat thoroughly Take antibiotics for the time required by the prescription even if the symptoms have disappeared. 3.Replenish fluids Drink at least 8 glasses of fluids or water daily to help flush the urinary tract 4.Advocate early follow-up Indications: Fever or persistent discomfort even 72 hours after starting treatment, inability to take oral antibiotics due to nausea and vomiting, and any new symptoms. 5, symptoms recur to see a doctor After completing the full course of antibiotic treatment and then symptoms of urinary tract infection, you need to see a doctor.