News & Views Insulin has never... Insulin has never become a cheap generic drug in the US because of companies’ small changes to “evergreen” the patent News Insulin has never become a cheap generic drug in the US because of companies’ small changes to “evergreen” the patent BMJ 2015; 350 doi: https://doi.org/10.1136/bmj.h1535 (Published 20 March 2015) Cite this as: BMJ 2015;350:h1535 Drug companie