muscle spasm
"If you're taking baclofen for general back spasms, BEWARE. There are so many other medicines that do a great job instead of baclofen. This is from "side effects"
'Do not use baclofen at a time when muscle tone is needed to assure safe balance and movement for certain activities. In some situations, it may endanger your physical safety to be in a state of reduced muscle tone'.

Well, muscle tone is needed to stand and do normal activities. BEWARE: do not take it when drinking alcohol."