Premarin’s 84-year hold on the market ends as FDA approves a generic version

Trade secret protections helped the hormone drug resist generic entry and outlast safety controversies—including link to cancer

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A story is told that after first obtaining approval for marketing Premarin in 1942, Wyeth Laboratories didn’t lock up the secret recipe for making the hormonal drug in a company safe, to be guarded by patent lawyers.

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By law, the Food and Drug Administration is required to determine whether a drug, device, biologic, or medical device is “safe and effective.” But the FDA determination does not control whether the Centers for Medicare & Medicaid Services will pay for it.  To satisfy CMS, medical products and services must be “reasonable and necessary,” meaning...

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