What's the mag BABY1? Is it a prescription muscle relaxer or OTC?

Also, update on my cramping - I went to the supplement store last Saturday and bought some Taurine. Started taking 2 grams/day for first couple then increased to 3 grams/day and haven't cramped up since! That stuff really works! Thanks everyone for letting me know about it. I still have tightness in lower back however so a muscle relaxer might actually make sense.