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Antiarrhythmic medicines are used to control heart rhythm disturbances. Several antiarrhythmics are harmful for people with heart failure and generally should be avoided. These medicines are available only by prescription.
If you have a heart rhythm disturbance, your doctor can use other medicines to manage it. If you have heart failure, your doctor will probably want you to avoid certain antiarrhythmics, such as quinidine, disopyramide, procainamide, and flecainide.