Was only on mirtazapine for 9 days because of the overwhelming fatigue side effect. how long before that goes away? last dose was last night.

It depends on dose.: Mirtazapine is kind of funny. At lower doses, it makes people pretty drowsy which can help if they're having sleep problems as part of their major depression. At higher doses that seems to go away. If you're on 15mg daily, the drowsiness probably won't go away. If fatigue is plaguing you through the day, it may well be a symptom of under-treated major depression and indicate undertreated depressio