Edited sentence: Escitalopram can be considered an example of "evergreening" (also called "lifecycle management")– the long-term strategy pharmaceutical companies use in order to extend the lifetime of a drug, in this case of the citalopram franchise.Escitalopram is an enantiopure compound of the racemic mixture citalopram, used for the same indication, and for that reason it required less investment and less time to develop.Two years after escitalopram's launch, when the patent on citalopram expired, the escitalopram sales successfully made up for the loss