<unk>  is an antidepressive agent that is FDA approved for the treatment of skeletal muscle spasm.   Common adverse reactions include constipation, indigestion, nausea, xerostomia, dizziness, somnolence, fatigue.
Cyclobenzaprine hydrochloride
Glycopyrronium bromide
Bethanechol chloride
Pilocarpine 
Dihydroergotamine 
Racepinephrine hydrochloride
Linsidomine
Dihydroergocryptine