I was bothered with sciatica for years. Sometimes it would be nearly impossible to get more that 2 hours sleep at a time. Could not sit, stand, nor lie down comfortably. And the side effects of the dr's meds were more that I could tolerate. I had to endure the pain. The pain stayed with me constantly. Sometimes sharp and other times mild, but nagging pain. All this was before I got into natural healing.
When I started natural healings, I went big time with vitamin C and echinacea to fight colds and build my immune system. When I would feel sniffles coming on, I would up the C to big levels. I slowly noticed that each time I went with large doses of C my back bothered me less. I thought it was my imagination until I kept experimenting with the C when my back would act up. I am 100% certain that it helped me. The probem is still there because I can stand in one spot for a few minutes and my leg will go numb. I take a lot of C now for maintenence and a large daily dose of iodine. I do not have colds nor the excruciating pain of sciatica.
Years after learning this I ran across an article about sciatica being caused by bacteria and treated with antibiotics. Seems I was already on to something by using the natural antibiotics of echinacea and vitamin C. Anyway here is a link that is interesting.
http://www.telegraph.co.uk/news/main.jhtml?xml=/news/2001/07/15/nscia15.xml&sSheet=/news/2001/07/15/ixhomef.html
I have never used the CO packs for sciatica, but have for many other aches or injuries and have had only good things to happen.
Good luck and do check out the inflammation/infection curing naturally with the C and echinacea.
Corey