• Fentanyl patch is used to treat moderate to severe chronic pain. It works in the brain and nervous system to cause anesthesia and decrease pain.

How should you take this medication?

• The dosage is based on your medical condition, response to therapy, and previous use of narcotics. Do not use more patches or change them more frequently than prescribed without your doctor's approval.
   
• Apply the patch to a flat surface such as the chest, back, side, or upper arm. Do not apply the patch on burns, cuts, or irritated skin. To avoid irritation, use a different area each time and wait at least 3 days before re-using the same area.
   
• In young children, apply the patch on the upper back. This reduces the chance of your child removing the patch and placing it in the mouth.

General Precautions with Fentanyl

• Tell your doctor if you have ever had any unusual or allergic reaction to a narcotic analgesic.
   
• Fentanyl may cause drowsiness or dizziness. Do not drive, operate machinery, or do anything else that could be dangerous until you know how you react to Fentanyl.
   
• Avoid drinking alcohol while taking this medicine.
   
• If you are pregnant or plan on becoming pregnant, discuss the risks and benefits using Fentanyl with your doctor.

What are the possible side effects of Fentanyl?

• Check with your doctor if any of these side effects persist or become bothersome: dizziness, drowsiness, constipation, dry mouth, headache, nausea or vomiting, unusual tiredness or weakness.