Propafenone (By mouth)
Antiarrhythmic, Group IC (About this – PubMed Health)
Uses of This Medicine
There is a chance that propafenone may cause new or make worse existing heart rhythm problems when it is used. Since it has been shown to cause severe problems in some patients, propafenone is only used to treat serious heart rhythm problems. Discuss this possible effect with your doctor.
This medicine is available only with your doctor’s prescription.
Other uses (PubMed Health)
How To Use
Long Acting Capsule, Tablet
Take your medicine as directed. Your dose may need to be changed several times to find what works best for you.
Swallow the extended-release capsule whole. Do not crush, break, or chew it.
You may need to carry identification stating that you are using propafenone. Ask your doctor about this.
Read and follow the patient instructions that come with this medicine. Talk to your doctor or pharmacist if you have any questions.
If a dose is missed:
Take a dose as soon as you remember. If it is almost time for your next dose, wait until then and take a regular dose. Do not take extra medicine to make up for a missed dose.
How to Store and Dispose of This Medicine:
Store the medicine in a closed container at room temperature, away from heat, moisture, and direct light.
Ask your pharmacist, doctor, or health caregiver about the best way to dispose of any outdated medicine or medicine no longer needed.
Keep all medicine out of the reach of children. Never share your medicine with anyone.
Drugs and Foods to Avoid
Ask your doctor or pharmacist before using any other medicine, including over-the-counter medicines, vitamins, and herbal products.
There are many other drugs that can interact with propafenone. Make sure your doctor knows about all other medicines you are using, especially digoxin (Lanoxin®), ketoconazole (Nizoral®), ritonavir (Norvir®), saquinavir (Fortovase®, Invirase®), other medicines for heart rhythm problem (such as amiodarone, disopyramide, dofetilide, lidocaine, quinidine, Cardioquin®, Cordarone®, Norpace®, Quinaglute®, Tikosyn®), blood pressure medicine (such as atenolol, metoprolol, propranolol, Tenormin®), or a blood thinner (such as warfarin, Coumadin®, Jantoven®).
Make sure your doctor knows if you are also using cimetidine (Tagamet®), rifampin (Rifadin®, Rimactane®), or orlistat (Xenical®). Tell your doctor if you use certain antibiotics (such as azithromycin, clarithromycin, erythromycin, Zithromax®), medicine for depression (such as amitriptyline, desipramine, nortriptyline, paroxetine, sertraline, Elavil®), or medicine for mental illness (such as prochlorperazine, promethazine, Compazine®, Phenergan®, Mellaril®, Trilafon®).
Tell your doctor if you smoke.
Do not eat grapefruit or drink grapefruit juice while you are using this medicine.
When Not To Use
Do not use this medicine if you have had an allergic reaction to propafenone. Your doctor will determine if this medicine is right for you, because this medicine should not be used if you have certain heart or heart rhythm problems, such as Brugada syndrome, heart failure, AV block, or sick sinus syndrome (unless you have an artificial pacemaker). Do not use this medicine if you have very low blood pressure, mineral imbalance (such as low salt levels in your blood), or lung disease (such as severe COPD).
Make sure your doctor knows if you are pregnant or breastfeeding, or if you have kidney disease, liver disease, myasthenia gravis, lupus, or breathing problems. Tell your doctor if you have heart disease or have recently had a heart attack. Make sure your doctor knows if you have a pacemaker.
This medicine affects your heart rhythm, so it could cause new or worse rhythm problems. Call your doctor if your symptoms do not improve or if they get worse.
This medicine can lower the number of white blood cells you have, so you might be more likely to get an infection. If you can, avoid people who are sick. Check with your doctor if you have a fever, chills, cough, or sore throat.
This medicine may decrease the amount of sperm men make. Talk to your doctor if you have concerns about this.
This medicine may make you dizzy or drowsy. Avoid driving, using machines, or doing anything else that could be dangerous until you know how this medicine affects you.
Your doctor will check your progress and the effects of this medicine at regular visits. Keep all appointments. You might need to have an electrocardiogram (ECG) or a blood test for your ANA level (antinuclear antibody).
Possible side effects
Summary More details
Call your doctor right away if you notice any of these side effects:
Chest pain, or worsening of heart rhythm problem
Lightheadedness, dizziness, or fainting
Unexpected heartbeat changes, fast or slow heartbeat
Unusual bleeding, bruising, or weakness
If you notice these less serious side effects, talk with your doctor:
Metallic or bitter taste
If you notice other side effects that you think are caused by this medicine, tell your doctor.
Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.
More side effects of this drug
Brand names include
Rythmol, Rythmol SR
There may be other brand names for this medicine.