http://theconversation.com/explainer-evergreening-and-how-big-pharma-keeps-drug-prices-high-33623 http://theconversation.com/explainer-evergreening-and-how-bi..

http://theconversation.com/explainer-evergreening-and-how-big-pharma-keeps-drug-prices-high-33623 http://theconversation.com/explainer-evergreening-and-how-bi... I'm not an expert and I can't comment on specifics. But I'm of the opinion that a small enhancement is not the same as an invention of a drug and it doesn't come anywhere close to extending the life of the patent - unless that tiny change actually makes a big different in effectiveness. Any good patent system should find a good balance between the two seemingly conflicting goals of incentivizing companies to innovate and keeping the price down for patients.