What is the best medication to relieve sciatica?

The stretches specific to sciatica and your sacroiliac joint will help you more than anything. My Mom just had a severe flare up, and when she went in, she was given a Medrol dose pack, which is a very strong, but temporary steroid, to reduce inflammation.

Many stretches and modified yoga poses have been studies and found very effective in sciatica treatment. I'd suggest you Che out sciatica.org where there's even a free 12min routine with pictures you could give a try for a week and see if you notice any improvement - and since it's free thats a bonus it may also be even more effective to do gentle stretching or yoga in combination with a medication.

The only thing that helped me was flector. It's a patch that calms down your back spasms, it worked great,

Stop going to a chiropracter, for one thing. If you had damage to your spine causing it, his adjustments sure aren't helping. See an orthopedic dr who specializes in the back. Meds like ibuprofen and aleve can help it.