From AI Overview: Drug companies can extend the
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Drug companies can extend the life of a patent by making small changes to the drug, such as:
Reformulating the drug to make it easier to dose or administer
Creating an extended-release version of the drug
Developing a new method of administering the drug, such as a nasal spray or dissolvable tablet
Discovering a new use for the drug
This process is sometimes called "evergreening" and can keep cheaper generic drugs off the market.