From Tracee Cornforth,
Your Guide to Women's Health.
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A. You've probably heard if you get one urinary tract infection, you should get ready for more frequent and recurrent UTIs. Although four out of five women have a second UTI within 18 months of the last one, the fact is that for the majority of women frequent, recurrent urinary tract infections are not a problem. On the other hand, if you are woman who has had at least three UTIs you can probably expect to have future infections. If you experience three or more urinary tract infections per year, ask your health care provider about your treatment options.

Frequent, recurrent urinary tract infections may be treated with one of the following treatment regimines:

• A six month (or longer) course of low dose antibiotic (TMP/SMZ or nitrofurantoin) therapy. This therapy has been shown to be effective with causing serious side effects.

• A single dose of antibiotic taken immediately after sexual intercouse.

• Using antibiotics for one to two days as soon as UTI symptoms begin.

  Source:The National Women's Health Information Center (NHWIC)