What side effects may I notice from receiving Fentanyl Citrate?

Side effects that you should report to your doctor or health care professional as soon as possible:

-allergic reactions like skin rash, itching or hives, swelling of the face, lips, or tongue
-breathing problems
-confusion
-signs and symptoms of low blood pressure like dizziness; feeling faint or lightheaded, falls; unusually weak or tired
-trouble passing urine or change in the amount of urine

Side effects that usually do not require medical attention (report to your doctor or health care professional if they continue or are bothersome):

-constipation
-dry mouth
-nausea, vomiting
-tiredness

This list may not describe all possible side effects for Fentanyl Citrate. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.