Cranberry on Urinary Tract Infections

Study Overview
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Brief Summary
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This study aims to determine whether a cranberry concentrate reduces recurrent urinary tract infections (UTIs) in women who consume it. About 150 adult women will participate in this study. Subjects will be randomized (like flipping a coin) to take either cranberry capsule or a placebo for 12 months. We expect cranberry supplement to have better results than the placebo. Subjects will not know which supplement they are taking. The primary outcome is the number of UTIs over 12 months.

Detailed Description
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Participants will attend their first study visit at a clinic at UBC. They will be randomized to the cranberry capsule or placebo. Participants will be instructed to consume the assigned supplement for the next 12 months. A calendar will be provided to record compliance and recurrent UTI. Participants will also record any side effects. They will be phoned each month to encourage participation and adherence. At 8 weeks and 6 months, they will be asked to return to the clinic to complete a midline questionnaire which will ask about any recurrent UTIs experienced. More supplements will be provided at their 6-month visit. At 12 months, participants will return to the clinic to complete an endline questionnaire. They will return any leftover supplements, calendar and side effect diary. If participants withdraw from the study, they will still be encouraged to return at 12 months to complete the survey to allow for intent-to-treat analysis.

Official Title
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A Randomized, Double-blind, Placebo Controlled Trial Evaluating the Effectiveness of a Cranberry Concentrate in Preventing Recurrent Urinary Tract Infections in Adult Women

Conditions
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Urinary Tract Infection

Intervention / Treatment
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* Drug: Cranberry
* Drug: Placebo


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Females who have had at least 2 clinical-diagnosed symptomatic UTIs in the year preceding Are sexually active Exclusion Criteria: Current UTI Pregnant or breastfeeding or planning a pregnancy in the next 12 months A known allergy or intolerance to cranberry-containing products A history of renal stones and/or renal transplantation Any immunosuppressive disease or other medical conditions that could potentially interfere with outcomes Current use of corticosteroid, anticoagulant, antidepressants or mood stabilizing medications or other medications that may interact with the supplement Intermittent or indwelling catheterization Any anatomic abnormalities of the urinary tract The use of any antibiotics within 2 weeks before study entry The use of any natural health products, including herbs, homeopathic products, or other forms of cranberry supplements within 2 weeks before study entry
Sexes Eligible for Study
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Female

Accepts Healthy Volunteers
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Accepts Healthy Volunteers

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Prevention
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Double


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: Cranberry<br>Each capsule contains 500 mg of cranberry powder at a concentration ratio of 36:1 (36 grams of cranberries equals 1 gram of concentrate). | Drug: Cranberry<br> <br> |
| Placebo Comparator: Placebo<br>A capsule containing control formulation | Drug: Placebo<br> <br> |

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Number of urinary tract infections | The number of symptomatic UTIs over 12 months (defined by self-report as having one or more of the following symptoms: dysuria, frequency, urgency, hematuria, supra-pubic pressure or fever), the proportion of participants with at least 1 symptomatic UTI, the median time to the first UTI | 12 months | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Side effects |  | 12 months |