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Learn about the side effects of fentanyl, from common to rare, for consumers and healthcare professionals.
Serious fentanyl side effects. Get emergency medical help if you have signs of an allergic reaction to fentanyl: hives, difficulty breathing, swelling of your face, lips, tongue, or throat. Like other narcotic medicines, fentanyl can slow your breathing. Death may occur if breathing becomes too weak.
Anyone who uses fentanyl—whether using transdermal fentanyl patches, prescription pills, injecting fentanyl, snorting fentanyl, or smoking the drug—is subject to experiencing a range of adverse (and potentially deadly) effects.
Fentanyl is up to 100 times more potent than morphine and 50 times more potent than heroin. Side effects include drowsiness, weakness, and dry mouth.
What side effects may I notice from receiving this medication? Side effects that you should report to your care team as soon as possible: Allergic reactions—skin rash, itching, hives, swelling of the face, lips, tongue, or throat
Some side effects may occur that usually do not need medical attention. These side effects may go away during treatment as your body adjusts to the medicine. Also, your health care professional may be able to tell you about ways to prevent or reduce some of these side effects.
Some side effects may occur that usually do not need medical attention. These side effects may go away during treatment as your body adjusts to the medicine. Also, your health care professional may be able to tell you about ways to prevent or reduce some of these side effects.