И при этом, самый эффективный. Вот текст с английской Википедии:Ремерон - это САМЫЙ дорогой Антидепрессант. САМЫЙ.
"Mirtazapine has been found to be one of the most effective antidepressants available and has a generally tolerable side effect profile. In a major systematic review published in 2009 which compared the efficacy and tolerability of 12 popular antidepressants, mirtazapine was found to be superior to all of the included SSRIs and SNRIs, reboxetine, bupropion, and mianserin in terms of antidepressant efficacy, while it was average in regards to tolerability"
Если коротко, то Миртазапин не имеет равных по соотношению "эффективность/побочки".