Even so, large amounts of drugs can build up in the kidneys. If you take these drugs for a long time, you may damage your kidneys. Preventing Urinary Tract Infections Research has shown that cranberry juice can help prevent recurrent urinary tract infections, particularly in older women. There is usually no harm in drinking moderate quantities of cranberry juice. If you already have an infection, however, drinking large amounts of cranberry juice or other acidic juices may aggravate the pain and should be avoided.
Good hygiene is also helpful.
Because a woman's urethra is very close to the vagina and fairly close to the rectum, infections can be passed from one of these openings to the others. For the same reason, women who are prone to infections should avoid tub baths and douches. Good hygiene after intercourse is also important. During intercourse, bacteria from the vagina or from the man's penis can enter the urethra. Cleansing the genital area after having sex helps prevent this.