I found this in the process of cleaning out my medicine cabinet. I am a very curious person and it doesn't have a label on it not to mention I have Raised 3 kids in my home and I now have a 19 year old and a 15 year old still living here. And the pill identifier is not identifing it. So what does that mean? Is it too old to be identified? It is a small round pill and has a line down the middle to break it in half. Above the line it says "901" and below the line it says "100" and it has nothing of the other side. Can anyone help?Thank you for your help.