Tizanidine
"Dr. ordered 6mg of this for back spasms because flexeril was not doing the job. Had the most bizarre reaction to any medication I ever took. I've had allergic reactions before but this was disturbing. Within 45 minutes of taking the 6mg capsule I could not open my eyes even though I tried. Then I started sweating profusely from every pore in my body. Then I became paralyzed! I tried to lift my arms and couldn't! My breathing became shallow and I started hallucinating! I was finally able to get out of my chair and get into bed after 2 1/2 hours. This was a "one and done" medication for me!"