The Evergreening of Biopharmaceuticals: Time to Defoliate

  title={The Evergreening of Biopharmaceuticals: Time to Defoliate},
  author={David F Lehmann and Sarabeth Wojnowicz},
  journal={The Journal of Clinical Pharmacology},
As a successful product approaches its date of patent expiration, chiral switching, that is, the isolation, testing, approval, and marketing of the pharmacologically active stereoselective isomer (enantiomer), termed “evergreening,” allows the manufacturer to maintain market share via exclusivity.1 The marketing of one stereoisomer typically emphasizes a single pharmacometric difference between the active and inactive enantiomer via extrapolation to the bedside.2 On rare occasions, eg, S… Expand
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