Having previously experienced pain ranked #10 on a pain scale of 1 to 10, that eye injury was about a 14. My tear duct and cornea and underneath the top and bottom eyelids were torn - not scratched, but torn. It hurt so much it made me throw up. It hurt so much my other eye refused to function in sympathy and I was blind for a few weeks. It hurt so much if I had the option to chop off my leg instead of have the eye injury, I would have opted for the loss of the leg. Okay - maybe that is a little drastic because I wouldn't give up my leg. But, the point is I had suffered big injuries prior to the eye incident and although those injuries were more critical, bigger, deeper, worse sounding, etc., they did not hurt anywhere as much as the eye injury.
All I know about that drug is that it left a yellow stain on my skin around my eye and it was instantaneous nirvana - not just feel better, it was everything is all right because I've gone to Heaven.