Robaxin is a prescription only drug, I don't see why it's being sold on amazon, though it's not scheduled. I thought it's illegal to sell or give any drug that is prescription only to a person who it's not prescribed for, regardless of it being scheduled or not.
As far as use as a recreational drug goes, both are muscle relaxers.... So it's not going to be very recreational other than making you feel relaxed and more than likely a little sedated.
Also, bluelight isn't here to help you get high. This thread is probably going to get closed. Wrong place to ask, you should know this.