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lifestyle · for uti prevention

Increased Water Intake

Reviewed by the Nimbera editorial team · Last updated May 2026

Hooton et al. (2018, PMID 30285042) RCT (n=140 premenopausal women with recurrent UTI and low baseline fluid intake) found adding 1.5 L water/day reduced mean annual cystitis episodes from 3.2 to 1.7 and extended infection-free interval from 84 to 143 days.Free

How to use

Aim to drink enough water to keep urine pale yellow - typically 2-3 litres of total fluid per day. Spread intake throughout the day. Urinate after sexual intercourse, which can introduce bacteria into the urethra.

How it works

Higher urine volume dilutes uropathogens and increases urination frequency, physically flushing bacteria from the bladder before they can adhere to the urothelium and establish infection.

Where to buy

No purchase needed. Tap water is effective.

Typical cost: Free

Safety notes

Overhydration (more than 4-5 L/day) can dilute serum sodium (hyponatraemia) - this is rare but possible in people with kidney or heart conditions. If you have a condition requiring fluid restriction, follow your doctor's guidance rather than increasing intake.

Drug & supplement interactions

  • Always tell your doctor or pharmacist about any supplements you take.
  • Interactions can occur with prescription medications, blood thinners, and immunosuppressants.
  • Herbal remedies can affect how the body absorbs or metabolises drugs.
  • Check drugs.com interactions checker before starting.

Clinical source

Hooton TM et al., Effect of Increased Daily Water Intake in Premenopausal Women With Recurrent UTIs: A Randomized Clinical Trial, JAMA Intern Med, 2018

This information is compiled from primary clinical literature and is for informational purposes only. It is not a substitute for professional medical advice. Read our full disclaimer.