Tricyclic antidepressant. It’s an older antidepressant and the newer ones are SSRI’s less side effects. I took mirtazapine 7.5 mg for sleep. Side effects are bad including suicidal thoughts. Before Covid I never took any drugs, just supplements. It appears I may also have sjoygren’s syndrome as well although the medical community is difficult to work with on this. I have severe insomnia, dry eyes, dry mouth, no taste, drinking water tastes metallic , no appetite, 30 pound weight loss ( not intentional) and severe hair loss.