The selective nature of the drug makes it preferable to other stress agents such as adenosine, which are less selective and therefore cause more side-effects. Regadenoson was approved by the United States Food and Drug Administration on April 10, 2008 and is marketed by Astellas Pharma under the tradename Lexiscan.
Human capital flight, sometimes called brain drain, refers to the emigration of intelligent, well-educated individuals for better pay or conditions, causing their places of origin to lose skilled people, or brains..
Definition of drain. 1  1 : a means (such as a pipe) by which usually liquid matter is drained. 2  2a : the act of drainingb : a gradual outflow or withdrawal : depletion a net drain from the East of five million souls â G. W. Pierson. 3  3 : something that causes depletion : burden a drain on the city's resources.