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what are the effect of fentanyl?

what are the effect of fentanyl?

Fentanyl can cause mild or serious side effects. The following list contains some of the key side effects that may occur while taking fentanyl. This list doesn’t include all possible side effects.

For more information on the possible side effects of fentanyl, or tips on how to deal with a troubling side effect, talk with your doctor or pharmacist.

Fentanyl can also cause other side effects.

More common side effects of fentanyl

The more common side effects that can occur with fentanyl include:

  • redness and irritation of your skin where you apply the patch
  • nausea
  • vomiting
  • tiredness
  • dizziness
  • trouble sleeping
  • constipation
  • increased sweating
  • feeling cold
  • headache
  • diarrhea
  • loss of appetite

These effects may go away within a few days or a couple of weeks. If they’re more severe or don’t go away, talk to your doctor or pharmacist.

Serious side effects of fentanyl

Call your doctor right away if you have serious side effects. Call 911 or go to your local emergency room if your symptoms feel life threatening or if you think you’re having a medical emergency.

Serious side effects and their symptoms can include the following:

  • Serious breathing problems. Symptoms can include:
    • very shallow breathing (little chest movement with breathing)
    • fainting, dizziness, or confusion
  • Severely low blood pressure. Symptoms can include:
    • dizziness or lightheadedness, especially if you stand up too quickly
  • Physical addiction, dependence, and withdrawal when stopping the drug. Symptoms can include:
    • restlessness
    • irritability or anxiousness
    • trouble sleeping
    • increase in your blood pressure
    • fast breathing rate
    • fast heart rate
    • dilated pupils (the dark centers of your eyes)
    • nausea, vomiting, and a loss of appetite
    • diarrhea and stomach cramps
    • sweating
    • chills, or hairs on your arms “stand up”
    • muscle aches and backache
  • Adrenal insufficiency. Symptoms can include:
    • long-lasting tiredness
    • muscle weakness
    • pain in your abdomen
  • Androgen deficiency. Symptoms can include:
    • tiredness
    • trouble sleeping
    • decreased energy

CONSTIPATIONConstipation (infrequent or hard bowel movements) is a very common side effect of fentanyl and other opioid medications. It’s unlikely to go away without treatment.

To help prevent or treat constipation while taking fentanyl, talk to your doctor about dietary changes, laxatives (drugs that treat constipation), and stool softeners. A doctor may prescribe laxatives with opioids to help prevent constipation.

DROP IN BLOOD PRESSURE WITH DOSAGE CHANGESAfter your first dose and when your doctor increases your doses of fentanyl, you may have a drop in blood pressure. Your doctor may have you check your blood pressure during these time periods.