By the end of 1961 about 1,500 pharmacist and doctors had informed Grünenthal about cases of nerve damage. Additionally, 300 consumers contacted Grünenthal directly to alert them about their nerve damage.
Source: Chronology of events provided by Beate Kirk, in: Der Conterganfall: eine unvermeidbare Arzneimittelkatastrophe? Dissertation. Greifswald 1998.