My ex wife gave my daughter an ambien (zolpidem) sleeping pill unknowingly, what should i do?

How old is she?: She will probably just sleep it off if she is 10 years or older. The greatest concern would be a reaction involving sleepwalking. Make sure that there's no way that she can exit the house during a sleepwalking event. Another concern would be the possibility of hallucinations. These could be frightening to her but she would unlikely remember them in the morning. If she is aware that she has said or done something that she doesn't remember, just reassure her that it was due to the medication and that she is not losing her mind.If she is under the age of 10 i would call her pediatrician or the local emergency room for further advice. I am an adult psychiatrist.