I have severe, persistent back pain. It started in March of 2009, after a really bad car accident, that I got into with a friend (I was the passenger and got the worst of it) the driver was unharmed. Anyhow, after years of MRIs, Arthrograms, Cortisone shots, and lots of Physical therapy, my Physical therapist decided to end my treatment with him, because I wasn t showing any improvements what so ever. Present day- I just got home a few hours ago, with my new prescription of Robaxin 500mg every 4 hours, for muscle spasms. I was looking into the Medication on line, and it seems my Doctor, prescribed me an extremely low dose? I believe this to be true, because I searched the web, and read several different Starting Doses, and Continuance Doses, which are way higher than mine? I am hoping for you to please shed some light on this matter, because i already took one about an hour ago, and feel NO RELIEF at all?