I found a pill that has M523on one side and 10/325 on the other and it is white
And oblong?

Sounds like oxycotin.
Yes that's how you spell it

Never give out what you "think" a pill may be! It's not safe to assume and you don't know why the other person wants to know... it's dangerous. It's best to refer someone to their local pharmacist for proper identification and disposal.

Does it look like this? If so it is Acetaminophen; Oxycodone Tablet (325 mg;10 mg)

http://gsm.about.com/photos/photo_us_h/051/oxyc010c.jpg