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A popular term for the efforts by a medical drug or device company with a patented and lucrative product for which the patent (and with it, exclusivity to market the product) is due to expire, to alter it in some way to ensure continued revenue. 

Evergreening manoeuvres Altering the formulation of the product or applying to the cognate regulatory body to market it to different patient populations or to the same population with new indications. 

Reference http://en.wikipedia.org/wiki/Evergreening  

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