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Rythmol SR Warnings and Precautions

Specific Precautions and Warnings With Rythmol SR

Some warnings and precautions to be aware of prior to taking this drug include the following:
  • In clinical studies, people who took antiarrhythmia medications similar to Rythmol SR after having a heart attack had a higher risk of death and the potential for their heart to stop than people who did not take the antiarrhythmia medication. It is unknown whether Rythmol SR is associated with the same risk. However, it is important to let your healthcare provider know if you have had a heart attack in the past two years.
  • Rythmol SR can cause or worsen heart rhythm problems, including potentially life-threatening arrhythmias. Your healthcare provider will check for these problems using an electrocardiogram (ECG) before and periodically during treatment.
  • This medication may cause or worsen heart failure. Let your healthcare provider know if you develop signs of heart failure, or if you have heart failure and your symptoms get worse. Some of the possible symptoms include:
    • Shortness of breath
    • Increased tiredness
    • Difficulty breathing
    • Swelling of the legs, ankles, or feet.
  • If you have a pacemaker, it will need to be monitored and possibly reprogrammed during and after Rythmol SR treatment.
  • This medication may decrease the number of white blood cells in your blood, increasing your risk for infections. Let your healthcare provider know if you experience signs of an infection, such as:
  • Rythmol SR should be used cautiously in people with liver or kidney disease. These people may need to be monitored more closely and may require lower doses.
  • This medication may cause a positive antinuclear antibody (ANA) test result. An ANA test is used to screen for autoimmune disorders. Most people on Rythmol SR who developed an abnormal ANA test during treatment did not have symptoms of autoimmune disease. However, there is one report of propafenone (the active ingredient in Rythmol SR) causing lupus, which resolved when the medicine was stopped.
  • Men who take this medication may experience a decrease in sperm count. This is reversible, and sperm count should return to normal once treatment is stopped.
  • Rythmol SR has been reported to cause a worsening of myasthenia gravis symptoms in people who have this condition. Myasthenia gravis is a disorder that causes weakness of the muscles. If you have myasthenia gravis, let your healthcare provider know if your symptoms get worse during Rythmol SR treatment.
  • Rythmol SR is a pregnancy Category C medication. This means that it may not be safe for use during pregnancy (see Rythmol SR and Pregnancy).
  • Rythmol SR passes through breast milk. Therefore, if you are breastfeeding or plan to start, discuss this with your healthcare provider prior to taking the drug (see Rythmol SR and Breastfeeding).
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Rythmol SR Drug Information

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