•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 of tramadol 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.