There are a number of less common, but more serious side effects of Celexa that you should report to your healthcare provider. These include, but are not limited to:
Extreme elation or feeling of happiness that may switch back and forth with a depressed or sad mood
Other unusual changes in behavior
Hallucinations
Fast heart rate
Chest palpitations
Difficulty sleeping
Signs of an allergic reaction, including unexplained rash, hives, itching, unexplained swelling, wheezing, or difficulty breathing or swallowing.
Rare Side Effects of Celexa
There are other possible problems that can occur in people taking Celexa. These rare side effects occur in less than 1 percent of patients. For these side effects, it is difficult to tell whether they are actually caused by the medication itself or something else.
Some of these rare but possible Celexa side effects include, but are not limited to: