The information provided here is meant to give you a general idea about each of the medications listed below. Only the most general side effects are included, so ask your doctor if you need to take any special precautions. Use each of these medications as recommended by your doctor, or according to the instructions provided. If you have further questions about usage or side effects, contact your doctor.
Treatment of arrhythmias depends on the type and seriousness of the particular rhythm disturbance. Medications are most often used to treat tachyarrhythmias (fast heart rates). These include:
Class IA QuinidineProcainamideDisopyramide
Class IB PhenytoinTocainideMexiletine
Class IC FlecainidePropafenoneMoricizine
Class II: Beta blockers PropranololMetoprolol
Class III BretyliumAmiodaroneSotalolIbutilideDofetilide
Class IV: Calcium Channel Blockers DiltiazemVerapamil
Miscellaneous Digitalis glycosidesAdenosine
In one way or another, all of these drugs act to slow the electrical activity in the heart. Many of them have additional uses, such as treating high blood pressure. All of them can produce serious side effects and must be used with great care and strict adherence to instructions.
Common names include: QuinidineProcainamideDisopyramide
Common names include: PhenytoinTocainideMexiletine
Common names include: FlecainidePropafenoneMoricizine
Class I drugs are the most prone to side effects outside the circulatory system.
Possible side effects include: SeizuresConfusionMental changesUnwanted heart rhythm changesNauseaDry mouthVomitingDiarrheaConstipationBone marrow damageClumsinessVision and hearing changesRashesComa
Common names include: PropranololMetoprolol
There are many beta blockers, but generally these 2 are the ones used to treat arrhythmias. All beta blockers are used primarily for blood pressure control or to treat
. Side effects are less wide ranging than Class I drugs.
Possible side effects include: Breathing problems, such as wheezingFatigueHeart failure
Common names include: BretyliumAmiodaroneSotalolIbutilideDofetilide
These agents are generally reserved for life-threatening ventricular arrhythmias and those that have been resistant to other treatments.
Possible side effects include: LightheadednessNauseaUnwanted heart rhythm changesLiver problems (sotalol, amiodarone)Lung damage (sotalol, amiodarone)Eye damage (amiodarone)Nerve damage (sotalol)Muscle damage (sotalol)Thyroid changes (sotalol, amiodarone)
Most of the drugs in this category are used to lower blood pressure or treat angina.
Common side effects include: LightheadednessNauseaWater retention
There is also a long list of more serious but rare side effects, depending upon the particular drug, which include: Liver damageKidney damageBone marrow damageWorsening heart failureUndesirable heart rhythm changes
These drugs are very effective at treating heart failure, but have much more restricted use in heart rhythm disturbances. They are primarily used to control the rate of ventricular response to tachyarrhythmias. Digitalis glycosides have a very narrow therapeutic window between taking too little and taking too much.
Common side effects include: NauseaVomitingUnwanted heart rhythm changes
is given intravenously to stop certain tachyarrhythmias.
Common side effects include: Chest pressureShortness of breathNauseaFlushingHeadacheLightheadedness
If you are taking medications, follow these general guidelines: Take the medication as directed. Do not change the amount or the schedule. Ask what side effects could occur. Report them to your doctor.Talk to your doctor before you stop taking any prescription medication.Plan ahead for refills if you need them.Do not share your prescription medication with anyone.Medications can be dangerous when mixed. Talk to your doctor if you are taking more than one medication, including over-the-counter products and supplements.
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How are arrhythmias treated?
National Heart, Lung, and Blood Institute website. Available at:
http://www.nhlbi.nih.gov/health/health-topics/topics/arr/treatment. Updated July 1, 2011. Accessed March 20, 2014.
Medications for arrhythmia. American Heart Association website. Available at: http://www.heart.org/HEARTORG/Conditions/Arrhythmia/PreventionTreatmentofArrhythmia/Medications-for-Arrhythmia_UCM_301990_Article.jsp#.VmcbIU2FMdU. Updated February 26, 2014. Accessed March 20, 2014.
Triola BR, Kowey PR. Antiarrhythmic drug therapy.
Curr Treat Options Cardiovasc Med.
Viskin S, Fish R, Glick A, et al. The adenosine triphosphate test: a bedside diagnostic tool for identifying the mechanism of supraventricular tachycardia in patients with palpitations.
J Am Coll Cardiol.
Last reviewed December 2015 by Michael J. Fucci, DO
Please be aware that this information is provided to supplement the care provided by your physician. It is neither intended nor implied to be a substitute for professional medical advice. CALL YOUR HEALTHCARE PROVIDER IMMEDIATELY IF YOU THINK YOU MAY HAVE A MEDICAL EMERGENCY. Always seek the advice of your physician or other qualified health provider prior to starting any new treatment or with any questions you may have regarding a medical condition.
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