Is it harmful to take prescribed drugs (nitrofurantoin and fluconazole) for UTI symptoms before doing a urine test, if you don't actually have UTI?

No. It is the rationale for treating UTI without culture. If you symptoms are typical a duck is a duck. So if the nitrofurantoin is working and symptoms resolve it does not matter that the culture does not grow an organism. However, if symptoms worsen the culture will grow a bacteria that can be identified and treated with right drug.

Related Questions

Is it okay to take prescribed drugs (nitrofurantoin and fluconazole) for uti symptoms before taking a urine test?

Yes. If it is certain that you have a UTI, the symptoms are more reliable than the test. Many doctors don't test at all You just want to be sure you are treating the right thing in the first place. For example, vaginal irritation would not improve with treatment for a UTI, but would give many of the same symptoms. Read more...

I have UTI symptoms but neg urine test. Taking Macrobid antibiotic. 2 more days of pills left. Still burns when I pee in morning. What should I do?

Go back to doctor. There are non-infectious causes for this, and Macrodantin (nitrofurantoin) may not cover some of the infectious causes effectively. You need to be re-examined and retested and consideration given to chlamydia, ureoplasma, etc. Good luck. Read more...