Pharmacology Cardiovascular system 9a9d4e70 Drug of choice for torsades de pointes? A Terfenadine B Quinidine C Isoprenaline D Magnesium sulphate High-Yield Explanation Mg sulfate is used for prolonged QT syndrome or Torsades de pointes. Quinidine and terfenadine cause Torsades de pointesRef: Goodman Gillman 11th ed pg 929-930