I take Baclofen for spaticity. My sx is more like a tight nylon is gripping my abdomen.

I had back pain. It was not related to MS. I went to the doctor for Flexeril and Vicodin. Helped enormously and problem solved. Until my back acts up again.

Interesting experience. Long story short. I saw a new PCP. It was a very positive experience. Turns out her husband has MS. She was asking how I was doing on Baclofen. She said that after prolonged use, it may stop working. She recommended Requip. It was originally used for Parkenson's Disease. It takes only a small dose. It helps her husband.

I do not know if this is what you would need for your back pain. I just thought I would throw it in and you can do what you like with it.