muscle spasm
"I've experienced recurring back spasms for many years. At times they are unbearable. Amrix really worked at easing the spasms, but I noticed a jittery feeling the next day. I also felt very shaky, but not dizzy, just jittery. It took about 24 hours after I stopped the medicine before the jitters went away. I also had a little slurred speech after one day of Amrix. I stopped the medicine and of course the spasms returned. "