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An antiarrhythmic is a medicine used to treat or prevent abnormal heart rhythms. These abnormal rhythms are called arrhythmias. Antiarrhythmics can slow overly fast rhythms, help restore a steadier rhythm, or prevent rhythm episodes from returning. They require careful medical supervision because some can also trigger or worsen rhythm problems.
read more about antiarrhythmic ...Antiarrhythmics affect the electrical signals that control heartbeat timing. Some block sodium channels, some block beta receptors, some block potassium channels, and others block calcium channels. These actions can change how electrical impulses start, move, or reset in the heart. The goal is to reduce dangerous or bothersome rhythm disturbances while avoiding unsafe slowing or new rhythm problems.
Antiarrhythmics are used for atrial fibrillation, atrial flutter, supraventricular tachycardia, ventricular tachycardia, and other rhythm disorders. They can be used after cardioversion, with implanted devices, or when symptoms continue despite other treatment. Some are used in emergencies, while others are taken long term. The choice depends on the rhythm type, heart structure, kidney and liver function, and drug interaction risk.
Common antiarrhythmic medicines include amiodarone, flecainide, propafenone, sotalol, dofetilide, dronedarone, quinidine, procainamide, lidocaine, mexiletine, diltiazem, verapamil, and adenosine. Some are grouped by the Vaughan Williams classes. Beta blockers and certain calcium channel blockers can also be used for rhythm control or rate control. Patients should use these medicines exactly as prescribed and keep monitoring visits.
Antiarrhythmics can cause dizziness, fatigue, nausea, shortness of breath, slow heartbeat, low blood pressure, or new rhythm problems. Some can prolong the QT interval and raise the risk of dangerous arrhythmias. Amiodarone can affect the thyroid, lungs, liver, eyes, skin, and nerves with longer use. Seek urgent care for fainting, chest pain, severe shortness of breath, very slow or racing heartbeat, or sudden weakness.
Yes, antiarrhythmics can be used for atrial fibrillation in selected patients. They can help control rhythm, reduce episodes, or support treatment after cardioversion.
Yes, some antiarrhythmics can cause or worsen abnormal heart rhythms. This is why dosing, testing, and monitoring are closely managed.
Yes, amiodarone is an antiarrhythmic. It can be effective for several rhythm problems but needs monitoring because it can affect multiple organs.
Do not stop an antiarrhythmic without medical guidance. Stopping suddenly can allow rhythm problems to return or worsen.
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Antiarrhythmic Medications. StatPearls (NCBI Bookshelf). https://www.ncbi.nlm.nih.gov/books/NBK482322/. Date Accessed June 3, 2026.
Amiodarone Oral Route. Mayo Clinic. https://www.mayoclinic.org/drugs-supplements/amiodarone-oral-route/description/drg-20061854. Date Accessed June 3, 2026.
AMIODARONE HYDROCHLORIDE tablet. DailyMed. https://dailymed.nlm.nih.gov/dailymed/drugInfo.cfm?setid=7ccd3733-c3af-4a11-8500-0f99194c1472. Date Accessed June 3, 2026.
Antiarrhythmics. Heart and Stroke Foundation. https://www.heartandstroke.ca/heart-disease/treatments/medications/antiarrhythmics. Date Accessed June 3, 2026.