People who have certain heart rhythm problems may receive a prescription medication called Rythmol to help get the heart rate back into a normal rhythm. This medicine comes as a tablet that is usually taken three times a day, every eight hours. It is available in brand-name and generic forms. Side effects may include dizziness, nausea, and vomiting.

What Is Rythmol?

Rythmol® (propafenone) is a prescription medication that belongs to a group of drugs known as antiarrhythmics. It is approved to:
  • Treat a type of irregular heartbeat known as ventricular arrhythmia when it is considered life-threatening
  • Help maintain a regular heart rate in certain people with heart arrhythmias known as paroxysmal atrial fibrillation/flutter or paroxysmal supraventricular tachycardia.
Rythmol is also available in an extended-release version, as Rythmol SR (propafenone SR).
(Click Rythmol Uses for more information on this topic, including possible off-label uses.)

Who Makes This Medication?

Rythmol is made by Halo Pharmaceutical, Inc., for GlaxoSmithKline.

How Does Rythmol Work?

Rythmol belongs to a group of medications known as Class I antiarrhythmics. Class I antiarrhythmic medications block sodium channels in the heart. Rythmol works by slowing down the speed at which electrical impulses move through the heart, which helps stabilize the heart rhythm.

When and How to Take It

Some general considerations to keep in mind during treatment with Rythmol include the following:
  • Rythmol comes in the form of a tablet. It is usually taken by mouth three times a day, every eight hours.
  • This medication can be taken with or without food. Try taking it with food if it seems to bother your stomach.
  • Take your Rythmol doses at the same times each day to keep an even level of the drug in your bloodstream.
  • For Rythmol to work properly, it must be taken as prescribed. Do not stop taking this medication, even if you feel well, as your irregular heartbeat may return.
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Rythmol Medication Information

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