Propafenone SR Side Effects

There are serious side effects that can occur with propafenone SR, so it is important to know which problems require immediate medical treatment. For instance, let your healthcare provider know right away if you develop unusual bruising, chest pain, or signs of an infection. Fortunately, most reactions to this drug tend to be minor. Some of the most common problems include constipation, fatigue, and dizziness.

An Introduction to Side Effects of Propafenone SR

Just like any medicine, propafenone SR (Rythmol SR®) can cause side effects. However, not everyone who takes the drug will have problems. In fact, most people tolerate it quite well. If side effects do occur, in most cases, they are minor and either require no treatment or are treated easily by you or your healthcare provider.
(This article covers many, but not all, of the possible side effects with propafenone SR. Your healthcare provider can discuss a more complete list with you.)

Serious Propafenone SR Side Effects

Some side effects are potentially serious and should be reported immediately to your healthcare provider. These include but are not limited to:
  • Signs of an allergic reaction, such as:
    • An unexplained rash
    • Hives
    • Itching
    • Unexplained swelling, especially of the mouth, lips, or throat
    • Wheezing
    • Difficulty breathing or swallowing
  • Signs of liver problems, such as:
    • Yellowing of the skin or whites of the eyes (jaundice)
    • Dark urine
    • Pain in the upper-right part of the abdomen (stomach)
  • Unusual bleeding or bruising
  • Signs of infection, such as:
  • A new or worsening irregular heartbeat
  • A slow, fast, or forcefully beating heart
  • Feeling faint or dizzy
  • Swelling of the arms, hands, legs, ankles, or feet
  • Unexplained, sudden weight gain
  • Problems breathing, including shortness of breath or wheezing
  • Chest pain
  • Severe or persistent diarrhea, vomiting, or sweating
  • Hearing problems
  • Vision problems, such as blurred vision
  • A change in the amount you normally urinate.
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