over-the-counter

I took half a pain-killer 
hours ago. So you know, 
if you see me half-squint 
half-wink
one eye
AT YOU - 

Nothing funny, there!
Just plumb down the line,
straightforth and true:  

My left half's in agony 
(cue wince/tic)!  
My right half's fine.

And 
I'm fine with it.
Ick.