Medically reviewed on July 19, 2018
What is Rythmol?
Rythmol is in a group of drugs called Class IC anti-arrhythmics. It affects the way your heart beats.
Rythmol is used in certain situations to prevent serious heart rhythm disorders.
Rythmol may also be used for purposes not listed in this medication guide.
You should not use this medication if you have untreated or uncontrolled congestive heart failure, a heart condition called "sick sinus syndrome" or "AV block" (unless you have a pacemaker), slow heartbeats or severely low blood pressure, an electrolyte imbalance, a breathing disorder such as asthma, or if you have recently had a heart attack.
Before taking this medicine
You should not use Rythmol if you are allergic to it, or if you have:
heart failure, or if you have recently had a heart attack;
a genetic heart condition, especially a certain heart rhythm disorder called Brugada syndrome;
a serious heart condition such as "sick sinus syndrome" or "AV block" (unless you have a pacemaker);
severe low blood pressure, or history of slow heart beats that have caused you to faint;
a severe or uncontrolled electrolyte imbalance (such as low levels of potassium in your blood); or
To make sure Rythmol is safe for you, tell your doctor if you have:
heart disease or prior heart attack;
a breathing disorder;
liver or kidney disease;
if you have ever had an abnormal blood test called Antinuclear Antibody Test or ANA.
It is not known whether Rythmol will harm an unborn baby. Tell your doctor if you are pregnant.
Rythmol may affect fertility (ability to have children) in men. Talk with your doctor if you have concerns about this risk.
Propafenone can pass into breast milk and may harm a nursing baby. You should not breast-feed while using this medicine.
How should I take Rythmol?
Follow all directions on your prescription label. Your doctor may occasionally change your dose to make sure you get the best results. Do not take this medicine in larger or smaller amounts or for longer than recommended.
You may take Rythmol with or without food.
Your heart function may need to be checked with an electrocardiograph or ECG (sometimes called an EKG), before and during treatment with Rythmol.
You may have very low blood pressure while taking this medication. Call your doctor if you are sick with vomiting or diarrhea, extreme thirst, loss of appetite, or if you are sweating more than usual.
While using Rythmol, you may need frequent blood tests.
Store at room temperature away from moisture, heat, and light. Keep the bottle tightly closed when not in use.
What happens if I miss a dose?
Take the missed dose as soon as you remember. Skip the missed dose if it is almost time for your next scheduled dose. Do not take extra medicine to make up the missed dose.
What happens if I overdose?
Seek emergency medical attention or call the Poison Help line at 1-800-222-1222.
What should I avoid while taking Rythmol?
Rythmol side effects
Get emergency medical help if you have any of these signs of an allergic reaction: hives; difficulty breathing; swelling of your face, lips, tongue, or throat.
Call your doctor at once if you have:
shortness of breath (even with mild exertion), swelling, rapid weight gain;
headache with chest pain and severe dizziness, fainting, fast or pounding heartbeats;
sudden weakness or ill feeling, fever, chills, sore throat, mouth sores, red or swollen gums, trouble swallowing;
confusion, unusual thoughts or behavior;
slow heart rate, weak pulse, fainting, slow breathing (breathing may stop).
Common side effects may include:
headache, dizziness, tired feeling; or
unusual or unpleasant taste in your mouth.
This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.
See also: Side effects (in more detail)
What other drugs will affect Rythmol?
Many drugs can interact with Rythmol. Not all possible interactions are listed here. Tell your doctor about all your current medicines and any you start or stop using, especially:
This list is not complete and many other drugs can interact with Rythmol. This includes prescription and over-the-counter medicines, vitamins, and herbal products. Give a list of all your medicines to any healthcare provider who treats you.
Remember, keep this and all other medicines out of the reach of children, never share your medicines with others, and use this medication only for the indication prescribed.
Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.
Copyright 1996-2018 Cerner Multum, Inc. Version: 9.02.
More about Rythmol (propafenone)
- Rythmol Side Effects
- During Pregnancy or Breastfeeding
- Dosage Information
- Drug Images
- Drug Interactions
- Support Group
- En Español
- 4 Reviews
- Generic Availability
- Drug class: group I antiarrhythmics