After several articles by renowned German neurologists were published in medical journals about Thalidomide and nerve damage, Grünenthal revised its package leaflet for Thalidomide and applied for the prescription-only status in select German federal states.

Source: Chronology of events provided by Beate Kirk, in: Der Conterganfall: eine unvermeidbare Arzneimittelkatastrophe? Dissertation. Greifswald 1998.