muscle spasm
"My doctor prescribed me this for muscle spasms in my neck and through my right shoulder/arm.  And by the time I was able to take it - -the spasms had quit on their own.  I never threw out the meds and recently my spasms started back up again -which they do on occasion.   My spasms are severe - - literally preventing me from being functional for upwards of 3 days.  Robaxin actually works and releases a lot of the stress and pain from my spasms.  Only downside is it takes upwards of an hour and a half or longer for me to feel the effects. Zero noticeable side-effects besides some mild drowsiness, which is no biggy.  Helps me sleep at night through the pain. I'd recommend this medicine."