Home > Health Library > Antiarrhythmic Medicines for Fast Heart Rates
Antiarrhythmic medicines work in various
ways to return the heart to its normal rhythm. These medicines stabilize heart
rhythm. One way is by decreasing abnormal firing of the heart's electrical system that
causes the heart to beat too fast. Another way is by slowing the electrical conduction
through abnormal pathways. Some antiarrhythmics also slow the heart rate by
reducing the number of impulses that can pass through the
atrioventricular (AV) node (amiodarone, sotalol).
Antiarrhythmic medicines are used to
change an abnormal heart rhythm to a regular rhythm and to prevent an abnormal
Antiarrhythmic medicines can
effectively control or prevent abnormal heart rhythms.footnote 1 There are many different
types of antiarrhythmic medicines. You may need to try different medicines to
see which one works best for you.
Some antiarrhythmic medicines raise your risk of having a dangerous arrhythmia such as ventricular
tachycardia or ventricular fibrillation. Your doctor will check you closely while you take these medicines. The risk of side effects might be greater if you have severe
All medicines have side effects. But many people don't feel the side effects, or they are able to deal with them. Ask your pharmacist about the side effects of each medicine you take. Side effects are also listed in the information that comes with your medicine.
Here are some important things to think about:
Call 911 or other emergency services right away if you have:
Heart symptoms such as:
Severe allergy symptoms such as:
Antiarrhythmic medicines can cause less serious side effects that may go away after taking the medicine for a while. Call your doctor if these side effects continue or if they bother you a lot.
Call your doctor if you have any side effects from amiodarone. Side effects may include:
Call your doctor right away if you have:
Other side effects of disopyramide may include:
Call your doctor right away if you have symptoms of heart failure, such as:
Other side effects of propafenone may include a change in taste, such as metallic taste in your mouth.
Other side effects of sotalol may include a slow heart rate.
See Drug Reference for a
full list of side effects. (Drug Reference is not available in all
Antiarrhythmic medicines might interact with many other medicines that you might take. Tell your doctor all of the medicines that you take. Be sure to include nonprescription medicines, vitamins, and natural supplements.
Grapefruit juice can affect some antiarrhythmic medicines such as sotalol. Ask your doctor if your medicine is affected by grapefruit juice and if you need to make any changes to avoid problems.
For more information, see Grapefruit Juice and Medicines.
If you take amiodarone, your doctor will check you carefully for side effects to make sure you can take the medicine safely. Talk to your doctor if you have any side effects or
any concerns about taking amiodarone. Because amiodarone can cause serious side effects, it is typically used for people who have severe symptoms when other medicines have
Medicine is one of the many tools your doctor has to treat a health problem. Taking medicine as your doctor suggests will improve your health and may prevent future problems. If you don't take your medicines properly, you may be putting your health (and perhaps your life) at risk.
There are many reasons why people have trouble taking their medicine. But in most cases, there is something you can do. For suggestions on how to work around common problems, see the topic Taking Medicines as Prescribed.
If you are pregnant, breast-feeding, or planning to get pregnant, do not use any medicines unless your doctor tells you to. Some medicines can harm your baby. This includes prescription and over-the-counter medicines, vitamins, herbs, and supplements. And make sure that all your doctors know that you are pregnant, breast-feeding, or planning to get pregnant.
Follow-up care is a key part of your treatment and safety. Be sure to make and go to all appointments, and call your doctor if you are having problems. It's also a good idea to know your test results and keep a list of the medicines you take.
Complete the new medication information form (PDF)(What is a PDF document?) to help you understand this medication.
Drugs for cardiac arrhythmias (2007). Treatment Guidelines From The Medical Letter, 5(58): 51–58.
ByHealthwise StaffPrimary Medical ReviewerRakesh K. Pai, MD, FACC - Cardiology, ElectrophysiologySpecialist Medical ReviewerJohn M. Miller, MD, FACC - Cardiology, Electrophysiology
Current as ofFebruary 20, 2015
Current as of:
February 20, 2015
Rakesh K. Pai, MD, FACC - Cardiology, Electrophysiology & John M. Miller, MD, FACC - Cardiology, Electrophysiology
How this information was developed to help you make better health decisions.
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