Rythmol SR

Generic Name: Propafenone

  • What is Rythmol SR?

    Rythmol SR is a medicine used to treat atrial fibrillation (irregular heartbeats). Rythmol SR can increase the amount of time between having symptoms of atrial fibrillation.

  • What is the most important information I should know about Rythmol SR?

    Rythmol SR can cause new or worsened abnormal heartbeats or heart failure. Your doctor will order an electrocardiogram before and during treatment to monitor your heart. Tell your doctor if you experience new or increased swelling in your arms or legs, trouble breathing, sudden weight gain, or other changes in your heart symptoms.

    Rythmol SR can affect how an implanted pacemaker works. Your doctor will check how your pacemaker is working during and after treatment with Rythmol SR as they may need to be reprogrammed.

    Rythmol SR can interfere with your bone marrow's ability to produce certain white blood cells called neutrophils. If this happens, you are more likely to get infections. Tell your doctor immediately if you experience a fever, chills, or sore throat while you are taking Rythmol SR, especially during the first 3 months of treatment.

    Rythmol SR can cause abnormal blood electrolyte levels (chemicals that are important for the cells in your body to function, such as sodium and potassium). Tell your doctor immediately if you experience diarrhea, sweating, vomiting, severe loss of appetite, or severe thirst.

    Rythmol SR can worsen myasthenia gravis (a disease characterized by long-lasting fatigue and muscle weakness) in people who already have this condition. Tell your doctor about any changes in your symptoms.

    Rythmol SR can lower sperm counts in men, which could affect the ability to father a child. Talk to your doctor if this is a concern for you.

  • Who should not take Rythmol SR?

    Do not take Rythmol SR if you are allergic to it, any of its ingredients, or if you have heart failure, had a recent heart attack, have an abnormally slow heartbeat without a pacemaker, or have very low blood pressure. Also, do not take Rythmol SR if you have abnormal electrolyte levels in your blood or certain breathing problems that make you short of breath or wheeze.

  • What should I tell my doctor before I take the first dose of Rythmol SR?

    Tell your doctor about all prescription, over-the-counter, and herbal medications you are taking before beginning treatment with Rythmol SR. Also, talk to your doctor about your complete medical history, especially if you have any other heart diseases, breathing problems, liver or kidney problems, myasthenia gravis, or lupus (disease that affects the immune system).

  • What is the usual dosage?

    The information below is based on the dosage guidelines your doctor uses. Depending on your condition and medical history, your doctor may prescribe a different regimen. Do not change the dosage or stop taking your medication without your doctor's approval.

    Adults: The recommended starting dose is 225 milligrams (mg) every 12 hours. Your doctor may increase your dose as appropriate.

    If you have liver impairment, an abnormal electrocardiogram, or other heart problems, your doctor will adjust your dose appropriately.

  • How should I take Rythmol SR?

    Take Rythmol SR exactly as prescribed by your doctor. You can take Rythmol SR with or without food. Do not crush or further divide the contents of the capsule.

  • What should I avoid while taking Rythmol SR?

    Do not drink grapefruit juice while you are taking Rythmol SR.

  • What are possible food and drug interactions associated with Rythmol SR?

    If Rythmol SR is taken with certain other drugs, the effects of either could be increased, decreased, or altered. It is especially important to check with your doctor before combining Rythmol SR with the following: amiodarone, anti-HIV medications called protease inhibitors (such as ritonavir or saquinavir), blood pressure/heart medications known as beta-blockers (such as atenolol or propranolol), blood thinners (such as warfarin), certain antidepressants (such as desipramine, fluoxetine, paroxetine, or sertraline), cimetidine, digoxin, erythromycin, grapefruit juice, ketoconazole, local anesthetics (such as lidocaine), orlistat, quinidine, or rifampin.

  • What are the possible side effects of Rythmol SR?

    Side effects cannot be anticipated. If any develop or change in intensity, tell your doctor as soon as possible. Only your doctor can determine if it is safe for you to continue taking this drug.

    Side effects may include: chest pain, chills, constipation, dizziness, fast or irregular heartbeat, fatigue, feeling anxious, fever, flu, nausea, sore throat, swelling, taste changes, tiredness, trouble breathing

  • Can I receive Rythmol SR if I am pregnant or breastfeeding?

    The effects of Rythmol SR during pregnancy and breastfeeding are unknown. Rythmol SR can be found in your breast milk if you take it while breastfeeding. Tell your doctor immediately if you are taking Rythmol SR and are pregnant, plan to become pregnant, or are breastfeeding.

  • What should I do if I miss a dose of Rythmol SR?

    If you miss a dose of Rythmol SR, take your next dose at your regular dosing schedule. Do not take two doses at once.

  • How should I store Rythmol SR?

    Store at room temperature.