Cranberry on Urinary Tract Infections
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.
|Study Design:||Allocation: Randomized
Endpoint Classification: Safety/Efficacy Study
Intervention Model: Parallel Assignment
Masking: Double Blind (Subject, Investigator)
Primary Purpose: Prevention
|Official Title:||A Randomized, Double-blind, Placebo Controlled Trial Evaluating the Effectiveness of a Cranberry Concentrate in Preventing Recurrent Urinary Tract Infections in Adult Women|
- Number of urinary tract infections [ Time Frame: 12 months ] [ Designated as safety issue: No ]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
- Side effects [ Time Frame: 12 months ] [ Designated as safety issue: Yes ]
|Study Start Date:||September 2014|
|Estimated Study Completion Date:||March 2016|
|Estimated Primary Completion Date:||December 2015 (Final data collection date for primary outcome measure)|
Each capsule contains 500 mg of cranberry powder at a concentration ratio of 36:1 (36 grams of cranberries equals 1 gram of concentrate).
Placebo Comparator: Placebo
A capsule containing control formulation
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.
Please refer to this study by its ClinicalTrials.gov identifier: NCT01881165
|Canada, British Columbia|
|The University of British Columbia|
|Vancouver, British Columbia, Canada, V6T 1Z4|
|Principal Investigator:||Tim Green, PhD||University of British Columbia|