This pill is light blue, and used to be round. It has been broken in half. If it was broken along a no-longer-visible cleft, then the pill was originally divisible into four doses. If it was broken incorrectly (no way to tell), then it was originally divisible into two doses (i.e., one cleft is visible on one side, but the fracture of the pill does not follow it). On the side with the cleft are visible the letter N (above the cleft) and the number 20 (below it). These are probably the remaining right-hand portions of a word (ending in N) and a four-digit number (ending in 20). On the reverse side of the pill is an indistinguishable maker's mark of some kind, nothing else. Thoughts? The pill identifier was stumped.