891 I 1949, Ackroyd reported the abrupt onset of severe thrombocytopenia and purpura in patients receiving the sedative allylisopropylacetylcarbamide (Sedormid).1 All the patients had taken Sedormid previously and had become sensitized to it. Today, this classic picture of drug-induced, immunemediated thrombocytopenia is most often caused by quinine in outpatients and by vancomycin in hospitali...
