http://www.nlm.nih.gov/medlineplus/d...r/a604030.html
In the information about this drugs, it says that one of the signs of overdose is hallucinations...
One thing to note is that everyone is different with meds, what may be a normal adult dose for one, maybe too much for someone else. I would definitely call the pharmacist and ask about your experience with this med. It seems that lots of people are having problems adjusting to it.