Antidepressants damage the dopaminergic system (among other things) and thereby prevent relaxation of one's muscles.The chronic muscle tension aka Parkinsonism is the most severe in one's jaw, neck and shoulders and a substantial percentage of TMJ cases are caused by antidepressants.If you want to call chronic tension wwhich often produces a mask like expression energy, go ahead.Paradoxically , antidepressants also cause extreme fatigue.