very stiff (rigid) muscles, high fever,
sweating, fast or uneven heartbeats, tremors, overactive reflexes;
nausea, vomiting, diarrhea, loss of appetite, feeling unsteady, loss of coordination; or
headache, trouble concentrating, memory problems, weakness, confusion, hallucinations, fainting, seizure, shallow breathing or breathing that stops breathing.
Reference
Drugs.com. (2010). Celexa information from drugs.com. Retrieved November 2, 2010, from http://www.drugs.com/celexa.