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What are the side effects of fentanyl citrate?

Common side effects of fentanyl citrate include nausea, stomach pain, vomiting, constipation, diarrhea, gas, heartburn or indigestion, loss of appetite, difficulty urinating, weakness, headache, depression, hallucinations, difficulty going to sleep or staying asleep, dry mouth, sweating, uncontrollable shaking, back pain, and itching. For the tablet, lozenge, and film forms of fentanyl, additional side effects may include drowsiness, weight loss, vision changes, anxiety, unusual thinking or dreams, flushing, chest pain, rash, and swelling of the hands, arms, feet, ankles, or legs.

Additionally, there may be pain, irritation, and even sores in the area of your mouth where you placed the drug. For the skin patch form of fentanyl citrate, additional side effects include mood changes, nervousness, confusion, memory problems, dizziness, and hiccups. There may also be pain, burning, tingling, numbness of the hands and feet, and skin irritation, swelling, itching, and redness at the site where you placed the patch on your skin. If any of the following side effects occur while using any form of the drug, call your doctor immediately or call 911:

-slow, shallow breathing
-heartbeat that is slower or faster than normal
-extreme drowsiness
-dizziness
-fainting
-confusion
-seizures
-chest pain
-rash
-coughing up blood

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    Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.