Can someone help me ID a pill?

I found this pill in my apartment and this is the only thing that will pop up. A picture of the same pill that someone else posted online asking wtf it is. This is the exact same pill I have and i can't find it on pill finder or anywhere on the internet

There's nothing on the other side of the pill. It just says "ES"

Of course I'm throwing it away ew. There's a reason I'm trying to find out what it is though