Abstract
To assess the prevalence, amount, and duration of use of vaginal estrogen cream among several birth cohorts of women from 1983 through 1992. Analyses are based on automated membership, pharmacy, and hospital discharge databases from Group Health Cooperative (GHC) of Puget Sound, a large health maintenance organization in Seattle, Washington. A total of 33,822 women, aged 45 years and older as of December 31, 1983, who were enrolled in GHC from 1983 to 1992 or who were enrolled at baseline and died in the following decade. About 24% of the cohort had filled at least one prescription for vaginal estrogen cream during 1983 through 1992, and about 60% of the users had more than one prescription filled. The annual birth cohort-specific prevalence of having filled one or more prescriptions for vaginal estrogen creams ranged between 1.6 and 8.2% across birth cohorts, whereas the average annual prevalence for the cohort was between 5.3 and 6.8%. The total amount, duration of use, and proportion of total estrogen exposure from creams increased with age of the birth cohort. Among the 733 women with intact uteri who were long-term cream users, 60.4% had no progestin prescriptions while averaging 22.1 tubes of estrogen cream. The prescription-filling patterns for estrogen in this cohort show an increase in the amount, years of use, and proportion of estrogen exposure from creams with the age of the birth cohort and extensive unopposed cream use among a small proportion of women with intact uteri. The systemic effects of vaginal estrogen cream among older postmenopausal women with urogenital atrophy deserve closer scrutiny.
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