Effexor Side Effects

Effexor Side Effects to Report

Some side effects of Effexor, while occurring infrequently, are potentially serious and should be reported immediately to your healthcare provider. These include but are not limited to:
 
  • Signs of serotonin syndrome (a rare but dangerous problems associated with certain medications) such as:
     
    • Confusion or other mental changes
    • A rapid heart rate
    • Nausea, vomiting, or diarrhea
    • Hallucinations
    • Blood pressure changes
    • An irregular heart rhythm
    • Overactive reflexes
    • Fever, sweating, or shivering
    • Shakiness
    • Agitation
    • Seizures
    • Coma
 
  • Suicidal thoughts or behavior (see Effexor and Suicide)
  • Anxiety, agitation, or panic attacks
  • Hostility or aggressiveness
  • Engaging in unusual or dangerous activities
  • Restlessness or inability to sit still
  • Extreme elation, or a feeling of happiness that may switch back and forth with a depressed or sad mood
  • Other unusual changes in behavior
  • Difficulty breathing, coughing, or chest pain
  • Heart palpitations
  • Difficulty sleeping
  • Signs of an allergic reaction, including:
 
    • Unexplained rash
    • Hives
    • Itching
    • Unexplained swelling
    • Wheezing
    • Difficulty breathing or swallowing.
 
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