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Mirtazapine is used to treat depression. Mirtazapine is in a class of medications called antidepressants. It works by increasing certain types of activity in the brain to maintain mental balance. Mirtazapine comes as a tablet and as a disintegrating tablet to take by mouth.
In structure, mirtazapine can also be classified as a tetracyclic antidepressant (TeCA) and is the 6- aza analogue of mianserin. It is also racemic âoccurs as a combination of both (R)- and (S)- stereoisomers.Its patent expired in 2004, so generic versions are available.n structure, mirtazapine can also be classified as a tetracyclic antidepressant (TeCA) and is the 6- aza analogue of mianserin. It is also racemic âoccurs as a combination of both (R)- and (S)- stereoisomers. Its patent expired in 2004, so generic versions are available.