what is a small round white pill that has a k then a score line then 18 on one side and is blank on the other?

Not medical advice: A small round white pill with K18 on one side is Oxycodone, a generic for Roxcodone. It is a narcotic pain reliever.

Monday, February 06 2012
Source: http://www.medicinenet.com/oxycodone/article.htm