The goal of this Pre-Post Quasi-experimental study is to investigates the effect of vaginal estrogen therapy on changes in the urinary microbiome and its association with improvement in overactive bladder (OAB) symptoms in menopausal women Primary Objective: To evaluate the effects of vaginal estrogen on the level of Lactobacillus in the urine of postmenopausal women with OAB. Secondary Objectives 1. To evaluate the effects of vaginal estrogen on urine microbiome in postmenopausal women with OAB. 2. To identify the association of alterations of urine microbiome after vaginal estrogen treatment with overactive bladder symptoms. After informed and consents process, urine samples for microbiome study will be collected from participants with sterile technique. 17β-estradiol 10 mcg will be given to the participants. The participants will be ask to use 1 tab daily for 2 weeks vaginally before bed, then 1 tab twice a week vaginally before bed until 12 weeks. Then they will come back to hospital to take urine sample for microbiome study.
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Change in Lactobacillus abundance
Timeframe: From enrollment to the end of treatment at 12 weeks