Cystitis: 1.5 liters of water per day halves cystitis

According to a Franco-American study, a daily consumption of 1.5L of water significantly reduces the occurrence of cystitis in women with recurrent infections of the urinary system.

More than half of premenopausal women report suffering from repeated episodes of cystitis. And after the occurrence of cystitis, recurrences are very frequent at one year: 44 to 77% of women would be affected.

However, a simple gesture turns out to be life-saving: drink more water, around 1.5 liters in addition to the usual consumption, a change that is far from trivial.

What are the symptoms of cystitis?

Acute cystitis usually includes the following symptoms:

  • pain or difficulty urinating,
  • feeling of a full bladder,
  • urgency or frequency of urination,
  • tenderness in the lower abdomen,
  • possibly blood in the urine.

Because these infections are usually treated with antibiotics, increasing beverage consumption could help reduce antibiotic use and thus control antibiotic resistance.

Less cystitis, less often

This randomized trial was placebo-controlled and spread over 12 months. 140 healthy women affected by recurrent episodes of cystitis and drinking less than 1.5 l of fluid per day were randomly assigned to:

  • Water group, which had to increase its usual consumption by 1.5 liters of water daily
  • Control group, which kept its habits
  • The results reveal that 93% of the women in the Water group had only 2 episodes of cystitis or less, while 88% of the women in the control group had 3 or more. On average, the number of episodes of cystitis was about half in the Water group, compared to the control group.

    Furthermore, the average annual number of antimicrobial treatment regimens used to treat episodes of cystitis was 1.9 in the Water group, compared to 3.6 in the control group. Finally, the mean time interval between events was 142.9 days in the Water group, compared to 85.2 days in the control group.

    Psssssst :  Too many antibiotics: long-term side effects

    For the authors of the study, drinking more water is therefore not only an accessible ritual, but also a very effective way of reducing the incidence of these urinary tract infections and the use of antibiotics.


    Hooton TM et al., Effect of Increased Daily Water Intake in Premenopausal Women With Recurrent Urinary Tract Infections. JAMA Intern Med., 2018; 178(11): 1509-1515.


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