Looking online it says the FDA doesn't allow any meds to be made without markings so per another website it would have to be a vitamin supplement of some sort. But I don't take them except for when I was pregnant & I checked it is not the Pre-Natals I used so I don't see it being a vitamin. Also was told by a friend it was a Percocet capsule but there's really no images to verify it to online. Could the markings rubbed off it it was old enough? Have picture if needed. Thanks guys!