First-line for uncomplicated urinary infections. Works in the bladder specifically, which is also its main limitation.
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Nitrofurantoin is an antibiotic that concentrates in the urine rather than in the blood. That is the whole point of it: it reaches high levels exactly where a bladder infection is, and comparatively low levels everywhere else.
Because of that, resistance has stayed low despite decades of use, which is why it remains first-line for uncomplicated urinary tract infections.
It does not treat kidney infections. Because it concentrates in urine rather than tissue, it does not reach the kidney in useful amounts — which is a critical distinction, not a technicality.
Usually twice daily for the modified-release form, or four times daily for the standard one. Typically three days for women with an uncomplicated infection, longer for men.
Take it with food. This improves absorption and substantially reduces nausea.
Drink plenty of fluids.
It turns urine dark yellow or brown. This is harmless and expected, but alarming if nobody warns you.
Complete the course — stopping when symptoms settle is a common route to recurrence.
Common: nausea, loss of appetite, headache, and the harmless discolouration of urine.
With long-term preventive use, two uncommon but important effects need mentioning, because they are the reason low-dose prophylaxis needs periodic review rather than indefinite continuation:
These are rare with a three-day course and the reason to be careful with three years of it.
Do not use it for a suspected kidney infection. Fever, back or flank pain, shivering, vomiting or feeling systemically unwell suggest the infection has gone beyond the bladder and needs a different antibiotic and urgent assessment.
Kidney function should be known before prescribing, particularly in older people, because it determines whether the drug will work at all.
Interactions are few. Magnesium-containing antacids reduce absorption. Quinolone antibiotics are antagonised.
Urine culture is useful for recurrent or treatment-failing infections, to confirm the organism is actually sensitive.
For anyone on long-term prophylaxis, periodic review of lung and liver symptoms is the meaningful monitoring.
Yes. Uncomplicated UTI in a non-pregnant woman is one of the conditions best suited to remote assessment — the diagnosis is largely made on symptom pattern, and speed genuinely matters.
What that involves: assessing the symptom pattern, excluding features suggesting a kidney infection, checking kidney function where relevant, and arranging urine culture for recurrent cases.
For recurrent UTIs after the menopause we would also raise something that is markedly under-prescribed: vaginal oestrogen substantially reduces recurrence and is one of the few interventions with good evidence for it. Repeated antibiotic courses without ever addressing that is a common pattern.
Where we will direct you elsewhere: suspected kidney infection, UTI in pregnancy, UTI in men with systemic symptoms, or anyone who is significantly unwell. Those need urgent in-person assessment.
This page is information, not an offer to supply.
Nitrofurantoin is inexpensive. On a private prescription the drug cost plus dispensing fee is usually around or below the England NHS prescription charge of about £10, and NHS prescriptions are free in Wales.
In England, community pharmacists can assess and treat uncomplicated urinary tract infection in women aged 16 to 64 under the NHS Pharmacy First scheme — free, without an appointment, and often the same day.
That is genuinely the fastest and cheapest option for a straightforward UTI, and we would rather send you there than take a fee for the same outcome.
Complete the course as prescribed — usually three days for an uncomplicated UTI in a woman, seven for a man. Symptoms often settle within 24 to 48 hours, well before the course ends.
Nitrofurantoin concentrates in the urine and does not reach useful levels in the kidney tissue or the bloodstream. That makes it excellent for a bladder infection and unsuitable for a kidney infection.
Flank or back pain, fever, rigors, nausea and vomiting suggest the infection has reached the kidney, and that needs a different antibiotic and prompt assessment — not another course of this one.
New breathlessness or a persistent cough, which can rarely indicate a lung reaction, and new numbness or tingling in the hands or feet, which can indicate nerve involvement. Both are rare and both are far more likely with prolonged low-dose preventive use than with a three-day course.
Nitrofurantoin turns urine a dark yellow or brownish colour. It is harmless and it stops when the course does.
It alarms people who were not warned, and it is easily mistaken for blood.
Usually within 24 to 48 hours. If nothing has improved by then, get reassessed rather than waiting out the course.
That usually means resistance, and a urine culture will show what will work.
No. It concentrates in urine and does not reach the kidney tissue itself.
Fever, back or flank pain, shivering and vomiting need urgent assessment and a different antibiotic.
Generally yes in the earlier stages, but it is avoided at term and around delivery because of a risk of jaundice in the newborn.
Always say if you are or might be pregnant — UTI in pregnancy is treated differently and more urgently.
Yes — it is better absorbed and much less likely to cause nausea.
Taking it on an empty stomach is the commonest reason people find it hard to tolerate.
The evidence is weak and inconsistent. They will not treat an infection you already have.
They also interact with warfarin, which is not widely known.
Fluids, not holding urine, and — after the menopause — vaginal oestrogen, which has genuinely good evidence and is badly under-used.
Recurrent infections deserve an explanation rather than a rolling supply of antibiotics.
There is no direct interaction. Alcohol irritates the bladder and dehydrates you, so it will not help how you feel.
Repeated courses select for resistant bacteria. A urine culture identifies what will work rather than guessing again.
That is the point at which the underlying cause needs looking at properly.
Clinically reviewed by Dr Mohammad Zubair Khan, GMC 7563469
Last reviewed
August 24, 2026
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