It's only half a pill, but it's a thick, round, white pill, with a coating that's different from the inside. There are no visible markings on one side. Since it's only half I can't be sure, but I'm pretty sure it's blank. But on the bottom half of the other side there is a distinct "10" but I can't tell what, if anything is written on the top half of that side. I found this in my sons pocket. Please help if this description sounds familiar at all. I need all the information I can before asking him. Thank you.