The things that concern me with mirtazapine are that it makes a lot of people gain weight and becomes less effective for sleep after a while as well as leaving you groggy the next day.
@4alien2 7,5 mg. I don't consider quitting, as it is still doing its job, though I agree with @RunningMan that it can become less effective after long term use.
@4alien2 - I was on it for 6 weeks a few months back. 15 mg. Felt good so came off and went back to feeling depressed. My T I believe stayed the same. I just went back on it 15 mg due to major noise induced spike. 4 days. It reduced my T immediately. Do I like being on it. No. Had no choice sleep was impossible with new spike. Hope this helps.