Generic Prempro products are not available in the United States. The patent for Prempro does not expire until January 2015. In addition, the estrogen component of the drug is so complex that it may be difficult to duplicate it in generic form. Some Web sites claim to sell a generic Prempro, but these medications may be fake and potentially dangerous.
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Prempro™ (conjugated estrogens/medroxyprogesterone) is a mixture of natural equine (horse) estrogens with medroxyprogesterone (a progestin-type hormone). It is approved for the following uses:
- Preventing osteoporosis in postmenopausal women
- Treating menopausal symptoms, such as hot flashes and vaginal dryness.
Prempro is made by Wyeth Pharmaceuticals, Inc. There are no generic versions of Prempro approved in the United States. However, if you search the Internet for "generic Prempro," you may find a number of Web sites selling it. The fact is that these medicines may be fake, substandard, and potentially dangerous. Generic Prempro may be available from another country, but there is no way of knowing if you are getting genuine Prempro or not. Therefore, you should not buy any generic versions until there is an approved version available.
Generic Prempro is not available for two reasons. First, the patent for the drug does not expire until January 2015. Second, the estrogen component of Prempro is a complex, natural product. It contains several different estrogens in various amounts. For this reason, it would be difficult to create a generic medication that is exactly like Prempro. The U.S. Food and Drug Administration (FDA) will not approve any generic versions of Prempro until several requirements are met. Most importantly, the exact composition of the estrogen components of Prempro must be fully evaluated. This is difficult because it is not clear which estrogen components of the drug are really "active" ingredients and which are not. Any potential generic versions must be shown to be identical to Prempro in terms of the content, dose, and absorption of these active components.