oh, and one more thing, if you think Mepivicaine or anything like it has been responsible for the questionable performances of horses in the last ten years who move up dramatically, I have a bridge I'd like to sell you.
This would block some pain, if given for that reason, but it sure as hell won't make a horse go 44:3 and open up by ten lengths, something a lot stronger than mepivicaine would be causing that.