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Narcan Side Effects

Serious Side Effects

Some side effects of Narcan are potentially serious and should be reported immediately to your healthcare provider. These include but are not limited to:
  • Agitation
  • Significant pain
  • Lightheadedness or fainting
  • A fast, irregular, or forcefully beating heart
  • Seizures
  • Signs of opioid withdrawal, such as:
    • Body aches
    • Fever
    • Sweating
    • Runny nose
    • Goosebumps
    • Yawning
    • Weakness
    • Shivering or trembling
    • Nervousness, restlessness, or irritability
    • Diarrhea
    • Nausea and vomiting
    • Abdominal (stomach) cramps
    • Increased blood pressure (hypertension)
  • Excessive crying in infants
  • Abnormal, involuntary movements
  • Extreme shortness of breath or difficulty breathing
  • Numbness, burning, pricking, or other unusual sensations of the skin
  • Seeing or hearing things that are not real (hallucinations)
  • Slow, shallow, or irregular breathing
  • Chest pain
  • Signs of an allergic reaction, such as:
    • An unexplained rash
    • Hives
    • Itching
    • Swelling of the mouth or throat
    • Wheezing
    • Difficulty breathing.  

Final Thoughts

You may experience some or none of the Narcan side effects listed in this article. Unfortunately, there is no way for your healthcare provider to know beforehand if you will have problems with a medicine that you have never tried.
Therefore, make sure to let your healthcare provider know if you develop any side effects while using Narcan or if something "just does not seem right." While it may not be related to the medication, your healthcare provider will be able to diagnose and treat the problem.
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Narcan Medication Information

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