Antiarrhythmics

Antiarrhythmics restore or control the heart's rhythm by changing how electrical signals form and travel through the heart. They are grouped by mechanism, including sodium channel blockers, beta blockers, potassium channel blockers, and calcium channel blockers. Amiodarone treats life-threatening ventricular arrhythmias and atrial fibrillation but can harm the lungs, thyroid, liver, and eyes with long-term use. Many antiarrhythmics can also cause new arrhythmias, so heart rhythm is monitored with ECGs.

• AdenosineKnown brand names include Adenocard.
• AmiodaroneKnown brand names include Pacerone and Nexterone.