Changes in generic drug appearance occur often. Patients’ and pharmacists’ responses to those changes vary, with some patients stopping their medication or using it less.
Assessing the Chiral Switch: Approval and Use of Single-Enantiomer Drugs, 2001 to 2011
From 2001 to 2011, the US Food and Drug Administration approved 9 single-enantiomer drugs with racemic precursors. None showed pre-approval evidence of improved efficacy over the racemic precursor.