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This medication is not for occasional ("as needed") use.

Get medical help right away if any of these very serious side effects occur: slow/shallow breathing, unusual lightheadedness, severe drowsiness/ dizziness, difficulty waking up.ĭo not use this medication to relieve mild, short-term, or sudden pain (such as due to headache/ migraine, dental/medical procedures), or pain after surgery (including same-day surgery when you do not need to stay in the hospital overnight). Be sure you know how to use fentanyl and what other drugs you should avoid using with it. Using this medication with alcohol or other drugs that can cause drowsiness or breathing problems may cause very serious side effects, including death. The risk for severe breathing problems is higher when you start this medication and after a dose increase, or if you use the wrong dose/strength. See also How to Use section for more information about addiction. To lower your risk, your doctor should have you use the smallest dose of fentanyl that works, and use it for the shortest possible time. Otherwise, it may cause overdose (even death). Do not use transdermal patches unless you have been regularly using moderate to large amounts of opioid pain medication. Fentanyl may also cause severe, possibly fatal, breathing problems. Fentanyl has a risk for abuse and addiction, which can lead to overdose and death.