Urinary tract infections become much more common after menopause, and for some women they stop being an occasional nuisance and become a cycle: burning, a course of antibiotics, a few weeks' relief, then the same thing again. Four or five courses a year is not unusual, and nor is planning a day around where the nearest toilet is.
What often goes unsaid is that the cause is largely hormonal, that a simple local treatment works very well for many women, and that one of the most popular supplements for bladder health has now been tested in a large UK trial and didn't help. This is a problem with good answers. They just aren't always offered.
In the UK, NICE defines recurrent urinary tract infections, or UTIs, as two or more infections in six months, or three or more in a year. If that describes you, it is worth asking for a proper plan rather than another short course of antibiotics.
A UTI usually means an infection of the bladder, also called cystitis. The typical symptoms are burning when you pass urine, needing to go urgently and often, cloudy or strong-smelling urine and pain low in the tummy.
The bladder, urethra and vagina all depend on oestrogen. When it falls, several things change at once.
The vaginal environment shifts. Before menopause, the vagina is dominated by lactobacilli, friendly bacteria that keep it acidic. With less oestrogen there are fewer lactobacilli, the vagina becomes less acidic, and bacteria from the bowel, especially E. coli, find it easier to settle near the urethra.
The tissues thin. The lining of the urethra and bladder becomes thinner and more easily irritated. This is part of what doctors call genitourinary syndrome of menopause. The bladder changes no one warns you about covers the wider picture.
Emptying gets less complete. Weaker pelvic floor muscles and, for some women, a mild prolapse can leave a little urine behind in the bladder, which gives bacteria somewhere to grow.
The result is that the defences that worked for decades start to fail, often quite suddenly.
The most effective preventive treatment for many women after menopause is also one of the simplest. Vaginal oestrogen, used as a cream, a small tablet or pessary, or a soft ring, restores the local tissues and the protective bacteria.
NICE reviewed the trials and found that it works well. Only about three women needed to use vaginal oestrogen cream, and about four the vaginal ring, for one of them to avoid a recurrent infection compared with placebo. Very few preventive treatments in medicine do that well.
A few things are worth knowing:
It also treats the dryness, soreness and painful sex that often come with the same tissue changes. See vaginal dryness and intimacy after menopause.
Methenamine hippurate, sold in the UK as Hiprex, is a tablet taken twice a day. It is not an antibiotic. In acidic urine it turns into a substance that stops bacteria growing, so bacteria do not become resistant to it in the same way.
The key evidence is the UK ALTAR trial, published in the BMJ in 2022. In this trial, 240 women with recurrent UTIs took either methenamine hippurate or daily low-dose antibiotics for a year. Those on methenamine had slightly more infections, about 1.4 a year compared with 0.9 on antibiotics, but the difference was within the limit the researchers had set in advance for it to count as a reasonable alternative. Side effects were similar and mostly mild.
NICE reviewed the evidence again after ALTAR and, in its 2024 update, added recommendations on methenamine hippurate. It can now be considered as an alternative to daily antibiotic prevention when simpler measures, including vaginal oestrogen for postmenopausal women, haven't worked. It's a reasonable thing to ask about, particularly if you're uneasy about taking antibiotics long term.
For some women, a low daily dose of an antibiotic, or a single dose taken after sex if infections follow it, is still the right choice. It works. The downsides are side effects and, over time, bacteria becoming resistant, which can make the next infection harder to treat. NICE advises reviewing it at least every six months.
D-mannose doesn't appear to work. It's a sugar sold widely for bladder health, and many women swear by it. The MERIT trial, run across 99 UK GP practices and published in 2024, gave nearly 600 women with recurrent UTIs either D-mannose or a placebo powder every day for six months. In the D-mannose group, 51% went on to seek help for a suspected UTI, compared with 56% on placebo. That gap is small enough to be chance, and the researchers concluded it shouldn't be recommended.
Cranberry has modest support. A 2023 Cochrane review pooled 50 trials across different groups of people. In the studies of women with recurrent UTIs, cranberry products cut the risk of symptomatic infections by about a quarter. The products varied a lot, and juice brings sugar, so capsules are the more practical choice if you want to try it. If you take warfarin, check with your doctor or pharmacist first, as cranberry may interact with it.
These are sensible, low-cost and worth doing, though the evidence for each on its own is limited:
After menopause, thinning tissues can cause burning, urgency and frequency that feel exactly like cystitis even when no bacteria are present. If repeated urine tests come back clear, it may be the tissue changes themselves, which respond to vaginal oestrogen rather than antibiotics. Bladder pain syndrome and overactive bladder are other possibilities.
Testing can also mislead. UK guidance advises against relying on urine dipsticks in women over 65, because bacteria in the urine without symptoms are common at that age and do not always need treating. A urine sample sent to the laboratory is more reliable.
Why do I keep getting UTIs after menopause?
Falling oestrogen reduces the protective bacteria in the vagina, makes the vagina less acidic and thins the lining of the urethra and bladder. Bowel bacteria find it easier to take hold.
Does vaginal oestrogen prevent UTIs?
Yes, for many postmenopausal women. In the trials NICE reviewed, about three women needed to use vaginal oestrogen cream for one to avoid a recurrent infection. It is very low dose and does not need a progestogen alongside it.
Does HRT stop UTIs?
Tablet HRT hasn't been shown to prevent them, and NICE doesn't recommend it for this. Vaginal oestrogen works locally and can be used with or without other HRT.
Is methenamine hippurate safe?
In the ALTAR trial it was a reasonable alternative to daily antibiotics, with similar, mostly mild side effects, and NICE now includes it in its guidance. It isn't suitable for everyone, for example some people with kidney or liver problems, so ask your doctor.
Does D-mannose work for recurrent UTIs?
A large UK trial in 2024 found no meaningful benefit compared with placebo. The researchers concluded it should not be recommended for prevention.
What counts as recurrent UTIs?
Two or more infections in six months, or three or more in a year, by NICE's definition.
Sources: National Institute for Health and Care Excellence, Urinary tract infection (recurrent): antimicrobial prescribing (NG112), updated 2024 · Harding C et al., Alternative to prophylactic antibiotics for the treatment of recurrent urinary tract infections in women (ALTAR), BMJ 2022;376:e068229 · Hayward G et al., d-Mannose for prevention of recurrent urinary tract infection among women (MERIT), JAMA Intern Med 2024;184(6):619-28 · Williams G et al., Cranberries for preventing urinary tract infections, Cochrane Database Syst Rev 2023 · National Institute for Health and Care Excellence, Suspected cancer: recognition and referral (NG12) · Educational only, not medical advice.
Keep reading: The bladder changes no one warns you about · Vaginal dryness and intimacy · Painful sex: why it happens · Low oestrogen symptoms · Take the free Hormone Quiz