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Hello, my name is***** and i will help you with Zeke.
First, how long ago did this happen. Tell me in hours/minutes.
This is important: was it plain Claritin or Claritin D.
Plain Claritin may make him lightly sedated and occasionally you might see some vomiting or diarrhea.
If, however it was ClaritinD, then it can be very serious. Symptoms are restlessness, irritability, high blood pressure and loss of appetite.