What are the possible side effects of Tramadol?

Get emergency medical help if you have any of these signs of an allergic reaction: hives; difficulty breathing; swelling of your face, lips, tongue, or throat.

Stop using tramadol and call your doctor at once if you have any of these serious side effects:

• agitation, hallucinations, fever, fast heart rate, overactive reflexes, nausea, vomiting, diarrhea, loss of coordination, fainting
• seizure (convulsions)
• a red, blistering, peeling skin rash; or
• shallow breathing, weak pulse

Less serious side effects may include:

• dizziness, drowsiness, weakness
• nausea, vomiting, constipation, loss of appetite
• blurred vision
• flushing (redness, warmth, or tingly feeling); or
• sleep problems (insomnia)

This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.