Tramadol side effects

Get emergency medical help if you have any of these signs of an allergic reaction to tramadol: 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 tramadol side effects may include:

• dizziness, spinning sensation;
  
• constipation, upset stomach;
  
• headache;
  
• drowsiness; or
  
• feeling nervous or anxious.
  

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.