Is mirtazipine a ssri

No, mirtazapine is not a selective serotonin reuptake inhibitor (SSRI). It is classified as a noradrenergic and specific serotonergic antidepressant (NaSSA). Mirtazapine works by increasing the release of norepinephrine and serotonin in the brain, but it does so through different mechanisms than SSRIs.