<unk>  is a medication used to prevent and treat abnormally fast heart rates. This includes ventricular and supraventricular tachycardias. Its use is only recommended in those with dangerous arrhythmias or when significant symptoms cannot be managed with other treatments. Its use does not decrease a person's risk of death. It is taken by mouth or injection into a vein. Common side effects include dizziness, problems seeing, shortness of breath, chest pain, and tiredness. Serious side effects may include cardiac arrest, arrhythmias, and heart failure. It may be used in pregnancy, but has not been well studied in this population. Use is not recommended in those with structural heart disease or ischemic heart disease.<unk>  is a class Ic antiarrhythmic agent. It works by decreasing the entry of sodium in heart cells, causing prolongation of the cardiac action potential.<unk>  was approved for medical use in the United States in 1985. It is available as a generic medication. In 2017, it was the 289th most commonly prescribed medication in the United States, with more than one million prescriptions.
Flecainide
Tocainide
Procainamide
Acecainide
Amiodarone
Ibutilide
Verapamil
Dofetilide