FENTANYL CITRATE Side Effects by Likelihood and Severity

COMMON side effects

If experienced, these tend to have a Severe expression i

  • trouble breathing
  • abnormal nervous system function affecting alertness

If experienced, these tend to have a Less Severe expression i

  • constipation
  • drowsiness
  • nausea
  • vomiting

INFREQUENT side effects

If experienced, these tend to have a Severe expression i

  • confusion
  • false sense of well-being
  • orthostatic hypotension, a form of low blood pressure
  • low blood pressure
  • decreased lung function
  • hallucinations
  • an inability to completely empty the bladder

If experienced, these tend to have a Less Severe expression i

  • dehydration
  • depression
  • dry mouth
  • headache
  • cough
  • nervousness
  • generalized weakness
  • anxious feelings

RARE side effects

If experienced, these tend to have a Severe expression i

  • decreased function of the adrenal gland
  • addiction to a drug
  • myoclonus, quick and involuntary muscle jerks
  • serotonin syndrome, a type of disorder with high serotonin levels
  • high blood pressure
  • blood clot in a deep vein of the extremities
  • blockage of the stomach or intestine
  • a tonic-clonic seizure
  • sleep apnea
  • a condition where the body is unable to maintain adequate blood flow called shock
  • a significant type of allergic reaction called anaphylaxis
  • high pressure within the skull
  • accidental falls

If experienced, these tend to have a Less Severe expression i

  • deficiency of a substance that promotes masculinization
  • nightmares
  • agitation
  • a change in vision
  • widening of blood vessels
  • tooth decay
  • a tooth disease
  • the inability to have an erection
  • itching
  • an abnormal increase in muscle tone
  • sensation of spinning or whirling
  • difficulty sleeping
  • excessive sweating
  • muscle tremors
  • abnormal manner of walking
  • weight loss
  • heart throbbing or pounding

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Selected from data included with permission and copyrighted by First Databank, Inc. This copyrighted material has been downloaded from a licensed data provider and is not for distribution, except as may be authorized by the applicable terms of use.

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.