I found these hidden in my friends drawer.. and I want to know what these are before I accuse her of using drugs.. which i suspect she is doing. so i need help clarifying..

These pills are..
-Flat on both sides(not curved as like advil)
-About 4-5MM thick
-Less then 1CM wide.
-Has a cross on one side so the pill can be broken in 4 pieces.
-Other side is completely blank (except someone wrote "80" on them in black ink)

It is urgent i know what these are for fear they are somehting really bad. thankyou.