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This antibiotic can be used to treat a urine infection that may occur related to sexual activity. Is this what your question is?
You only take it if you feel like you have a urine infection after sex. It may also sometimes be used to treat urine infections at other times, but a urine culture should be done first to determine what the bacteria is to see if this the appropriate antibiotic for the infection. Hope this helps.
Those antibiotics may or may not work for random UTIs. It is only good for uncomplicated urine infections. This is why a urine culture may be needed to see if this antibiotic will work or not.