Or they try to prolong their patents or very slightly change the formula of an existing drug so they can patent it again: <a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Generic_drug#Prolongation" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Generic_drug#Prolongation</a>