According to drugs.com, the pill you found is ‘methocarbamol’ 750 mg; the link includes an actual picture of the pill:
http://www.drugs.com/imprints.php?action=search&imprint=v+4212&color=12&shape=
Also, from Drugs.com:
“Methocarbamol is a skeletal muscle relaxant. The precise way it works is unknown, but it is thought to depress the central nervous system. It has no direct effect on the muscle.”
http://www.drugs.com/cdi/methocarbamol.html
Good luck—
Bill
I put the "v 4212" into an online pill identifier, but it said it couldn't come up with anything. Are you positive that's what it says? Are there any other markings? It did say that it's possible that it's some type of generic drug that isn't in their database, but I have never been able to stump them with anything, everything I have ever entered into the search has come back with an ID.
Ghilly