Hi doctor. while I was visiting Toronto, a doctor gave me Robaxisal 400mg tablets, to take 2 tablets every 6 hours.,for severe back ache. I took 3 doses but now I am getting swelling on both of my feet, upto the knees, with numbness. I already discontinued the medication. is it something to worry or is it a side effect and what shall I do . thanks. arshad.