T46: Poisoning by, adverse effect of and underdosing of agents primarily affecting the cardiovascular system
T46.2: Poisoning by, adverse effect of and underdosing of other antidysrhythmic drugs, not elsewhere classified

excludes1
poisoning by, adverse effect of and underdosing of beta-adrenoreceptor antagonists (T44.7-)
T46.2X: Poisoning by, adverse effect of and underdosing of other antidysrhythmic drugs

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