No, Premarin and Provera are very different. Although they are both sex hormones produced in females they sort of have different functions.
Premarin contains synthetic conjugated estrogens and Provera contains progestin.
Premarin is a mixture of estrogen hormones used to treat symptoms of menopause such as hot flashes, and vaginal dryness, burning, and irritation. Other uses include prevention of osteoporosis in postmenopausal women, and replacement of estrogen in women with ovarian failure or other conditions that cause a lack of natural estrogen in the body. Premarin is sometimes used as part of cancer treatment in women and men.
Estrogen is a female sex hormone produced by the ovaries. Estrogen is necessary for many processes in the body.
Premarin should not be used to prevent heart disease or dementia, because this medication may actually increase your risk of developing these conditions.
Provera (medroxyprogesterone) is a progestin (a form of progesterone), a female hormone that helps regulate ovulation (the release of an egg from an ovary) and menstrual periods.
Medroxyprogesterone is used to treat conditions such as absent or irregular menstrual periods, or abnormal uterine bleeding. Medroxyprogesterone is also used to decrease the risk of endometrial hyperplasia (a condition that may lead to uterine cancer) while taking estrogens.
Medroxyprogesterone is also used to prevent overgrowth in the lining of the uterus in postmenopausal women who are receiving estrogen hormone replacement therapy
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