Who should not take Rythmol SR?

The following conditions are contraindicated with this drug. Check with your physician if you have any of the following:


  • high levels of potassium in the blood
  • myasthenia gravis
  • a skeletal muscle disorder
  • severe disease of the arteries of the heart
  • bundle branch block
  • torsades de pointes
  • a type of abnormal heart rhythm
  • slow heartbeat
  • abnormal EKG with QT changes from birth
  • sudden drop in blood pressure
  • liver problems
  • blood circulation failure due to serious heart condition
  • structural disorder of heart
  • low amount of potassium in the blood
  • a heart attack
  • heart attack within the last 30 days
  • atrioventricular block
  • a type of slow heart rhythm disorder
  • sick sinus syndrome
  • prolonged QT interval on EKG
  • chronic heart failure
  • worsening of debilitating chronic lung disease called COPD
  • bronchospastic lung disease
  • decreased kidney function
  • CYP2D6 poor metabolizer
  • very low levels of granulocytes
  • a type of white blood cell
  • Brugada syndrome


  • Propafenone

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CONDITIONS OF USE: The information in this database is intended to supplement, not substitute for, the expertise and judgment of healthcare professionals. The information is not intended to cover all possible uses, directions, precautions, drug interactions or adverse effects, nor should it be construed to indicate that use of a particular drug is safe, appropriate or effective for you or anyone else. A healthcare professional should be consulted before taking any drug, changing any diet or commencing or discontinuing any course of treatment.