Drug Identification Guide

I have a white pill that has an M with a square around it on one side and a 15 on the other...White/Round?

It also have a score back the 15 is on the bottom side of the score. I checked drugs.com identifier and couldnt find it. I think its a pain killer, but not positive.

Public Comments

1. it could either be prinivil (ACE inhibitor) or potassium chloride
2. http://www.drugs.com/imprints/m-15-5065.html Is that it? Oxycodone, 15mg