Redness, swelling, blisters, or changes in skin color at the site of application may occur. These effects usually disappear within a few minutes or hours. If any of these effects last or get worse, tell your doctor or pharmacist promptly.
If irritation or a burning feeling occurs, remove the patch(es) and do not reapply until the irritation is gone.
If your doctor has directed you to use this medication, remember that he or she has judged that the benefit to you is greater than the risk of side effects. Many people using this medication do not have serious side effects.
Tell your doctor right away if you have any serious side effects, including: blurred vision, mental/mood changes (e.g., nervousness, confusion), drowsiness, dizziness, unusually slow heartbeat.
Get medical help right away if you have any very serious side effects, including: pale/bluish/gray skin, unusual tiredness, shortness of breath, fast heartbeat.
A very serious allergic reaction to this drug is rare. However, get medical help right away if you notice any symptoms of a serious allergic reaction, including: rash, itching/swelling (especially of the face/tongue/throat), severe dizziness, trouble breathing.
This is not a complete list of possible side effects. If you notice other effects not listed above, contact your doctor or pharmacist.
In the US - Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088 or at www.fda.gov/medwatch.
In Canada - Call your doctor for medical advice about side effects. You may report side effects to Health Canada at 1-866-234-2345.