Mirtazapine is an antidepressant. Mirtazapine affects chemicals in the brain that may become unbalanced and cause depression. Mirtazapine is used to treat major depressive disorder. Mirtazapine may also be used for purposes not listed in this medication guide.
Mirtazapine, the active ingredient in Remeron, has a tetracyclic chemical structure, hence classified as tricyclic antidepressants. The drug belongs to a group of chemical compounds known as piperazino-azepines. Remeron forms range from a white to creamy crystalline powder which moderately dissolves in water. Each tablet of this drug contains hydroxypropyl cellulose, corn starch, lactose, magnesium stearate and other inactive ingredients.