muscle spasm
"I have had cervical fusion in the past and when I am extremely stressed or do too much manual labor I sometimes get severe muscle spasms. I was given samples of Amrix and took it in the evening and slept like a baby. The next day at work I didn't have any drowsiness, but also did not have spasms or pain until it was time to take again. I took it only for 5 days and it was enough to calm the muscles down."