muscle spasm
"Yikes! I don't like taking medication of any kind. I've had a frozen shoulder for 8 months and am ready to gnaw off my own arm from the pain and lack of mobility. My PCP prescribed this for shoulder impingement.

 I took half of a 10 at 8 pm and slept all night. I do have a very dry mouth and feel hung-over this morning. I'd reserve this for bedtime use only."