What Are The Effects Of Xanax Tablets In Children?

my oldest boy got from the cabinet the bottle of xanax and opened it(i gues i didn't close it well), and I found the bottle opened on the counter, he says he didn't take it, but my consern is that i have a 18 month old girl and I'm not sure if she took any pill... but if she did what are the symptoms of the swallowing the xanax? It has been 35 min since I found out and her behavior has not changed at all. I made her before throw up, but it came only milk that she drank before that... please help me ,,,,Mandi