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Description of Lists by Risk Groups

List 1: Drugs that are generally accepted by authorities to have a risk of causing Torsades de Pointes.

List 2: Drugs that in some reports may be associated with Torsades de Pointes but at this time lack substantial evidence for causing Torsades de Pointes.

List 3: Drugs to be avoided for use in patients with diagnosed or suspected congenital long QT syndrome. (Drugs on Lists 1 and 2 are also included here.)

List 4: Drugs that, in some reports, have been weakly associated with Torsades de Pointes but that, when used in usual dosages, are unlikely to be a risk for Torsades de Pointes.