Perimenopause with no mental health problems but was hit with bad insomnia leading to low level anxiety over a year ago, sometimes awake for 72 hours straight. Prescribed mirtazapine at 15mg but been taking only 3.75mg for months because starting HRT has really helped me. I feel best on this combination of HRT and a minimum dose of mirtazapine. Is anyone else taking a low (7.5mg or less) level of mirtazapine? Any concerns or problems doing so indefinitely? I feel like I'll need it until I'm done with Perimenopause.