muscle spasm
"Took two ten mg tablets then tried to sleep. Couldn't sleep because of legs and upper back spasming the same or worse and then . Fell asleep three times for thirty minutes to an hour each time only to wake up because of spasming and then discovering I had pooed myself a little each time. It gave me horrible diarrhea. I would rather be knocked out with a few firm punches to the face than to try this stuff again. I'm fairly certain it not only didn't help, but it made everything worse."