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Shots: Drug patent expiry is when a patent granted to a pharmaceuticalcompany for a particular drug expires, allowing other companies to produce and sell generic versions Like every other utility patent, pharmaceuticals also get market exclusivity of 20 years.
Since the turn of the millennium, Pfizer has embarked on a series of mega-mergers, gobbling up Warner-Lambert in 2000, Pharmacia and Upjohn in 2002, Wyeth in 2009, and Medivation in 2016. In 2014 the company made an offer of around $100 billion to acquire UK firm AstraZeneca (which at the time was going through a rough patch ).
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