An antiarrhythmic drug used in the treatment of tachycardia, atrial fibrillation, and arrhythmias associated with conditions such as Wolff–Parkinson– White syndrome (a congenital abnormality of heart-rhythm).
It is given, as tablets or injection, to people resistant to or intolerant of other treatment; and treatment is always initiated in hospital.
Side effects may include dizziness, visual disturbances, and worsening, or a new type of, arrhythmia.
Rarely, nausea, vomiting, urticaria, vertigo, and jaundice occur.
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