anxiety
"Mirtazapine is initially sedating, this gradually reduces over about a month.  The sedation rapidly reduces anxiety and improves sleep.  After the first month the sedative effect wears off and you may feel the drug has stopped working, it has not!  The longer term antidepressant/anxiety benefits take several months to reach maximum benefit.   After 3 months most side effects disappear.   My biggest side effect is increased appetite, I compensate by exercising more as I love to eat!  I started on 15mg dose and increased this to 30mg after a month.  Overall 6 months on my anxiety is 80% better than before."